A car drives up a hill on an icy road near Sarajevo, Bosnia, Monday, Jan. 18, 2016. (AP Photo/Amel Emric)

Roads were closed, travel was crippled and many Eastern Europeans lost power as an intense snowstorm moved across the continent over the weekend.

The winter storm hit parts of Romania, Serbia, the Czech Republic, Bulgaria and Poland on Sunday, and Croatia's Adriatic coast suffered through frigid temperatures and strong winds.

At least 12 major roads and three Black Sea ports had to be closed Sunday in Romania due to the storm, according to the country's transportation ministry. At least three flights and 20 trains were called off because of the snow, authorities added.

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Some 14 communities in Romania suffered power outages and the Education Ministry said schools would close Monday in Bucharest, the capital, and in other southeastern regions.

The Interior Ministry said 6,000 officers were helping to clear the snow.

The cold snap also gripped other countries, causing traffic problems and power outages. Poland's Interior Ministry said Friday that 72 people have frozen to death since November, when temperatures first dipped below 32 degrees Fahrenheitwhile a further 29 people were asphyxiated by fumes from coal heaters.

In Bulgaria, heavy snowfall of up to 15 inches were recorded in some parts of the Balkan nation and temperatures dipped to 14 below.

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Hundreds of refugees traveling from Macedonia trudged through the snow, braving freezing temperatures to arrive Sunday at the registration center in Presevo in southern Serbia.

Milica Nikolic, a doctor at the registration camp, said the refugees risked frostbite due to the low temperatures. Aid workers inside the camp handed out warm tea and soup to the migrants Sunday before they resumed their journey to Western Europe.

Sub-zero temperatures and strong winds battered the Adriatic Sea coast in Croatia, disrupting some ferry lines and air traffic in the coastal city of Dubrovnik.