Dimitar Dilkoff / AFP - Getty Images
A man walks as the sun rises behind chimneys of a thermal power station in Sofia, Bulgaria, on Jan. 31, 2012. Record low temperatures were registered around Bulgaria Tuesday, as the mercury continued to drop, threatening shipping on the Danube and closing hundreds of schools.
Yuriy Dyachyshyn / AFP - Getty Images
A girl looks out from a bus window covered with frost on Jan. 30, 2012 as temperatures reached -15 degrees Celcius in the western Ukrainian city of Lviv.
Vassil Donev / EPA
A woman walks during a frosty early morning in Sofia, Bulgaria, on Jan. 31, 2012. Many parts of the country are experiencing temperatures of minus 21 degrees Celcius.
Maurizio Gambarini / EPA
An employee of the Red Cross talks to a homeless person spending the night outside in Berlin, Germany, on Jan. 30, 2012. The cold weather creates a situation where shelters cannot accommodate everyone looking for a roof for the night. On the night of Jan. 29, 467 people sought shelter but only 315 places were available.
Murad Sezer / Reuters
A man walks in the snow covered Sultanahmet square with the Blue Mosque in the background, in Istanbul, Turkey, on Jan. 31, 2012.
AP reporting from BELGRADE, Serbia -- Officials have appealed to people to stay indoors and be careful. Police searched for the homeless to make sure they didn't freeze to death. In some places, heaters will be set up at bus stations.
Still, 18 people, most of them homeless, died in Ukraine from hypothermia and nearly 500 people sought medical help for frostbite and hypothermia in just three days last week, the Emergency Situations Ministry said. Read more.