A dam in southern Bulgaria collapsed after 48 hours of heavy rain, flooding a village and killing at least four men.

A 3 meters wave swept 800 houses in the village of Bisser, near the Greek border, after the dam on the Ivanovo reservoir collapsed.

The contry’s civil defense warned that two other big dams in the region, Ivaylovgrad and Studena, are on the brink of overflowing and urged people there to be ready for an evacuation.

Authorities declared a state of emergency in much of southern Bulgaria, which is experiencing 48 hours heavy rain.

Landslides derailed the engine of an Istanbul-bound international train near the border town of Svilengrad, causing no injuries.

The big freeze has caused traffic chaos throughout Europe, blocking roads, shutting down airports, and trapping thousands in remote mountain villages in the Balkans.

But it has also offered opportunities for snowy fun: Ice skaters in the Netherlands were hopeful they could stage a race that hasn’t happened in more than a decade; children in Rome and along the usually temperate Adriatic coast in Croatia frolicked in rare snow; and Bosnians in the capital, Sarajevo, spontaneously organized a winter “Olympics” in which they skied down main streets and leapt out of windows into deep snow banks.

Schools will also be closed in Rome on Tuesday, as Italy copes with unusually heavy snow for the Mediterranean country. So far, ten deaths have been linked to winter weather, including two people who were crushed under a collapsed roof south of Rome, and a 91-year-old woman in the northeast port of Trieste who was knocked down by strong winds.

In the north, rescuers had to pluck people from their homes, as piles of snow reached 3 meters in some areas. In Milan, Italy’s fashion and financial capital, temperatures fell to minus 12 Celsius on Monday, and the authorities opened a section of the city subway to shelter some homeless people.