Troops in Serbia set up an emergency 500-bed field hospital Monday, a day after neighboring Kosovo re-imposed a nighttime curfew in four cities, as the Balkans battled to contain a surge in coronavirus infections that underscored the risks of swiftly easing lockdowns.

The makeshift hospital in a sports hall in the Serbian capital, Belgrade, is a “precautionary measure” as hospitals in the capital are reaching their capacity because of the coronavirus outbreak, the city's deputy mayor, Goran Vesic, said. Serbian infections have returned to levels last seen at the peak of the pandemic in the Balkan country in March and April.

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Serbian soldiers set up beds for treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

Troops in Serbia set up an emergency 500-bed field hospital Monday, a day after neighboring Kosovo re-imposed a nighttime curfew in four cities, as the Balkans battled to contain a surge in coronavirus infections that underscored the risks of swiftly easing lockdowns.

Serbian soldiers set up beds for the treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

The country went from having some of Europe’s toughest lockdown measures to a near-complete reopening at the beginning of May. Soccer and tennis matches were played in front of packed stands, resulting in several players testing positive. Serbian tennis star Novak Djokovic and other players also caught the virus following an event he organized in Serbia and the Croatian Adriatic resort of Zadar.

A Serbian soldier walks between treatment areas set up for possible COVID-19  infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

Spain also was taking action to rein in regional spikes, two weeks after the hard-hit country ended a state of emergency in force since mid-March. Over 28,000 people are confirmed to have died from the virus in Spain.

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

The restrictions were coming into force at the start of Europe's summer holiday season that usually sees millions of people crisscrossing the continent in search of sun, sand and cultural highlights.

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

Some 400 people, wearing white clothes and traditional red scarves, gathered at noon at a central Pamplona square where in normal times more than 12,000 would witness the launch of a rocket known as “Chupinazo” to open the nine-day festival, bathing each other with red wine and champagne.

Serbia's rising infections provide a chilling insight into how the virus, while retreating in much of Europe, can roar back if lockdowns are lifted too swiftly.

Serbian soldiers set up beds for treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

Serbian soldiers set up beds for treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

The country went from having some of Europe’s toughest lockdown measures to a near-complete reopening at the beginning of May. Soccer and tennis matches were played in front of packed stands, resulting in several players testing positive. Serbian tennis star Novak Djokovic and other players also caught the virus following an event he organized in Serbia and the Croatian Adriatic resort of Zadar.

Greece moved to contain the burgeoning threat by banning Serbs from crossing its only open land border from Monday morning. The new restrictions caused a seven-kilometer (four-mile) traffic jam at the Promahonas border crossing with Bulgaria. Authorities eventually allowed scores of cars into Greece that had been trapped overnight.

On Sunday, Kosovo Prime Minister Avdullah Hoti reimposed nighttime curfews in the capital, Pristina, and three other cities with sharply rising infection rates. Public transport also was hit, with bus seating cut by half. A day earlier Kosovar authorities reported 8 deaths from the coronavirus, the highest daily number in the Western Balkan country since the start of the outbreak in March. New daily cases were 178, also the highest so far.

Serbian soldiers set up beds for the treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

Serbian soldiers set up beds for the treatment of possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

Spain also was taking action to rein in regional spikes, two weeks after the hard-hit country ended a state of emergency in force since mid-March. Over 28,000 people are confirmed to have died from the virus in Spain.

Restrictions were in force Monday affecting some 70,000 residents in the northwestern county of A Mariña, on the northern Atlantic coast, and over 200,000 in northeastern Catalonia’s Segrià county around Lleida.

The latter is particularly worrying because it affects migrant laborers harvesting fruit who are considered highly vulnerable to contagion because many endure basic living and working conditions.

A Serbian soldier walks between treatment areas set up for possible COVID-19  infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

A Serbian soldier walks between treatment areas set up for possible COVID-19 infected patients inside of the Belgrade Arena, in Belgrade, Serbia, Monday, July 6, 2020. Serbian authorities have declared an emergency in the capital Belgrade because of a surge in the new coronavirus cases. Emergency measures also have been introduced in several other towns in Serbia where hospitals have been overwhelmed by COVID-19 patients in recent days. (AP PhotoDarko Vojinovic)

The restrictions were coming into force at the start of Europe's summer holiday season that usually sees millions of people crisscrossing the continent in search of sun, sand and cultural highlights.

Paris was one city rolling out the welcome mat, reopening the world-renowned Louvre Museum, home to Leonardo da Vinci's Mona Lisa. The Eiffel Tower reopened June 25. Face masks were a must and visitor numbers were limited, with reservations required.

Thrill-seeking tourists and locals in Spain, however, were out of luck. The San Fermin festival that features the adrenaline-charged running of the bulls in Pamplona was scheduled to open Monday but has been canceled due to fears the packed streets could become a virus spreading event.

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

Some 400 people, wearing white clothes and traditional red scarves, gathered at noon at a central Pamplona square where in normal times more than 12,000 would witness the launch of a rocket known as “Chupinazo” to open the nine-day festival, bathing each other with red wine and champagne.

There was better news for Britons planning a Greek vacation getaway. Greece’s government announced that direct flights from the United Kingdom to all airports in Greece can resume as of July 15. Government spokesman Stelios Petsas said the decision was taken “in cooperation with the British government and after the recommendation of experts.” Greece had previously banned all flights from Britain due to the extent of the coronavirus spread there.

Meanwhile, the British government threw a 1.57 billion-pound ($1.96 billion) lifeline to museums, galleries, theaters, movie theaters, heritage sites and music venues hit by coronavirus lockdowns.

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

Guide speakers demonstrate to warn about their financial situation in front of the Louvre Museum, in Paris, Monday, July 6, 2020. The home of the world's most famous portrait, the Louvre Museum in Paris, reopened Monday after a four-month coronavirus lockdown. (AP Photo Thibault Camus)

“When we heard last night, we slept for the first time since March,” said Kwame Kwei-Armah, artistic director of London’s Young Vic theater.