At least four Balkan nations have suspended shipping on the Danube River because of severe frost and the vast amount of ice blocking the heavily travelled waterway.
Bulgaria, Croatia, Romania and Serbia made the decision because up to 90 per cent of the river's surface is covered with floating ice, authorities said on Wednesday.
AP video shows an icebreaker slicing through a section of the Danube in Romania.
The boat struggled to leave shore at first and its crew used a long metal pole and vigorous steering manoeuvres to pry it free. As the boat cut its way through the frozen river, a group of adult pelicans accompanied by their young swam near a large chunk of ice.
The conditions are making it extremely difficult to traverse Europe's main commercial waterway, which winds 2,860km from Germany and serves as the natural border between Bulgaria and Romania.
Europe has been battling a deep freeze that started in late January and has killed hundreds, snow that has trapped thousands in Balkan mountain villages and prompted worries of flooding as heavy snow melts. In Greece and Bulgaria, flooding on Monday and Tuesday left dozens of homes under water and at least eight dead.
Serbian emergency officials have said the country's army will use explosives to break up ice on the Danube and Ibar rivers to try to prevent flooding.
The Sava and the Danube are partially frozen, with large chunks of ice floating down the two rivers. In some parts, ice on the Danube is 15 centimetres thick, but so far it hasn't jeopardised the work of Serbia's biggest Djerdap hydropower plant, near the Romanian border, officials said.
Serbia also banned any shipping along the Sava and Tisa rivers. An official, Milos Milovanovic said "the entire Sava river is blocked with ice, even around Belgrade.
"We will make maximum effort in the next 10 days or so to break the ice," he said.
The fear is the rivers could overflow because of the ice, and jeopardise the work of the hydropower plants.
Elsewhere, strong wind knocked over power lines and left tens of thousands without electricity in Bosnia, potentially for the next several days.
Half of the town of Mostar, Bosnia's second largest city, is without power and snow piled some 80cm cis preventing teams from dealing with the problem, government spokesman Pero Pavlovic said.
People in Mostar fell into a "shopping hysteria", emptying shelves and in some cases getting into fist fights over flour, he said.
The Polish Interior Ministry said on Wednesday that six more people died as a result of the freezing weather. It also called on people be careful when using coal heaters, reporting that one person died of asphyxiation. The temperatures in the country fell at times to minus 32 C.
In Bulgaria, the government declared on Wednesday a day of mourning for eight people who died after torrential rains and melting snow caused a dam to burst, flooding an entire village. Two people are missing and rescue operations were continuing.
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