At least 14 have died amid clashes between protesters and Ukrainian police in Kiev, in the most violent day in the 12-week-old protest.

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Thai policemen aim their weapons towards anti-government protesters during clashes near Government House in Bangkok February 18, 2014. At least three police officers were wounded as Thai authorities launched an operation to clear anti-government protesters from streets in Bangkok on Tuesday. REUTERS/Athit Perawongmetha

Pilot Cory Butner, Christopher Fogt, pilot Nick Cunningham and Dallas Robinson of the U.S. cheer on compatriots pilot Steven Holcomb (front) and Steven Langton as they finish the final run of the men's two-man bobsleigh competition at the 2014 Sochi Winter Olympics February 17, 2014. REUTERS/Fabrizio Bensch

Sightseers look at a frozen rock face along the Apostle Islands National Lakeshore of Lake Superior, the world's largest freshwater lake, near Cornucopia, Wisconsin February 14, 2014. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. The Great Lakes, which contain one fifth of the world's surface fresh water, are 88% covered with ice. Picture taken February 14, 2014. REUTERS/Eric Miller 

Belarus' Anton Kushnir competes during the men's freestyle skiing aerials qualification round at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 17, 2014. REUTERS/Dylan Martinez

A winter storm that froze the U.S. southeast in its tracks pushed north on Thursday, with driving winds and heavy snow snarling travel and closing many schools from Washington to Connecticut, creating havoc for winter-weary parents.

Hundreds of thousands of Georgia, North and South Carolina residents hit by a heavy blast of ice a day earlier remained without power as the storm made its way up the coast, closing much of Washington and threatening to drop up to 18 inches of snow in some areas.