A crowd of young Lebanese men gather to watch while across the border, Israeli excavators dig into the rocky hills.

The mood is light as the crowd observes what Israel says is a military operation — dubbed "Northern Shield" — aimed at destroying attack tunnels built by the Lebanese Hezbollah militia.

More Images
In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag while standing next to Hezbollah and Lebanese flags, at the site where Israeli excavators are working, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

A crowd of young Lebanese men gather to watch while across the border, Israeli excavators dig into the rocky hills.

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier walks next to an excavator, near the southern border village of Mays al-Jabal, Lebanon, Thursday, Dec. 13, 2018. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

The Lebanese soldiers nearby were visibly on high alert, deploying to new camouflaged posts behind sandbags and inside abandoned homes.

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border, next to a wall that was built by Israel, in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border, next to a wall that was built by Israel, in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier looks out from one of their new positions, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier looks out from one of their new positions, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard next to cameras at their new position in front of a Hezbollah flag, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard next to cameras at their new position in front of a Hezbollah flag, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag, as they observe Israeli excavators working near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag, as they observe Israeli excavators working near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier sets up a camera at one of their new position, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier sets up a camera at one of their new position, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Lebanese villagers smoke a water pipe and take souvenir pictures in front of Israeli excavators, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Lebanese villagers smoke a water pipe and take souvenir pictures in front of Israeli excavators, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers and UN peacekeepers gather at the site where the Israeli army works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers and UN peacekeepers gather at the site where the Israeli army works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, a Lebanese soldier takes his position at the site where Israeli excavators work, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, a Lebanese soldier takes his position at the site where Israeli excavators work, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard at the site of their excavation work, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard at the site of their excavation work, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in front of the Israeli town of Metula, background, near the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in front of the Israeli town of Metula, background, near the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, villagers smoke a water pipe in front of an Israeli excavator, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, villagers smoke a water pipe in front of an Israeli excavator, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

But the scene highlights the palpable anxiety that any misstep could lead to a conflagration between Israel and Lebanon that no one seems to want.

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag while standing next to Hezbollah and Lebanese flags, at the site where Israeli excavators are working, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag while standing next to Hezbollah and Lebanese flags, at the site where Israeli excavators are working, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

The Lebanese soldiers nearby were visibly on high alert, deploying to new camouflaged posts behind sandbags and inside abandoned homes.

About two dozen U.N. peacekeepers stood in a long line, just ahead of the blue line demarcating the frontier between the two countries technically still at war.

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier walks next to an excavator, near the southern border village of Mays al-Jabal, Lebanon, Thursday, Dec. 13, 2018. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier walks next to an excavator, near the southern border village of Mays al-Jabal, Lebanon, Thursday, Dec. 13, 2018. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border, next to a wall that was built by Israel, in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border, next to a wall that was built by Israel, in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier looks out from one of their new positions, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier looks out from one of their new positions, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard next to cameras at their new position in front of a Hezbollah flag, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard next to cameras at their new position in front of a Hezbollah flag, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag, as they observe Israeli excavators working near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, UN peacekeepers hold their flag, as they observe Israeli excavators working near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier sets up a camera at one of their new position, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, an Israeli soldier sets up a camera at one of their new position, near the Lebanese southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Lebanese villagers smoke a water pipe and take souvenir pictures in front of Israeli excavators, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Lebanese villagers smoke a water pipe and take souvenir pictures in front of Israeli excavators, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers and UN peacekeepers gather at the site where the Israeli army works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers and UN peacekeepers gather at the site where the Israeli army works on the Lebanese-Israeli border in the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, a Lebanese soldier takes his position at the site where Israeli excavators work, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, a Lebanese soldier takes his position at the site where Israeli excavators work, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard at the site of their excavation work, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli soldiers stand guard at the site of their excavation work, near the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in front of the Israeli town of Metula, background, near the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, Israeli military equipment works on the Lebanese-Israeli border in front of the Israeli town of Metula, background, near the southern village of Kafr Kila, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, villagers smoke a water pipe in front of an Israeli excavator, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)

In this Thursday, Dec. 13, 2018 photo, villagers smoke a water pipe in front of an Israeli excavator, in the southern border village of Mays al-Jabal, Lebanon. As Israeli excavators dig into the rocky ground, Lebanese across the frontier gather to watch what Israel calls the Northern Shield operation aimed at destroying attack tunnels built by Hezbollah. But Lebanese soldiers in new camouflaged posts, behind sandbags, or inside abandoned homes underscore the real anxiety that any misstep could lead to a conflagration between the two enemy states that no one seems to want. (AP PhotoHussein Malla)