The Israeli military says it has exposed a fourth Hezbollah attack tunnel dug from Lebanon.

The military said Sunday that it has placed explosives in the tunnel as part of an open-ended operation to identify and destroy the cross-border passageways. Israel says the tunnels were built by Hezbollah militants to carry out attacks against Israelis.

Hezbollah, which used such tunnels inside Lebanon in the 2006 war, has yet to comment on the operation, which began two weeks ago.

Israel has called on the international community to impose new sanctions on the Iranian-backed Hezbollah, a heavily-armed mini-army with an arsenal of some 150,000 rockets that can reach nearly every part of Israel.