Article content continued

All shipping has been halted since Wednesday on the 137 kilometres of the Danube flowing through Croatia, Mr. Barovic told AFP.

Serbian railways meanwhile said Thursday that the famed Balkan Express train, running from Belgrade to Istanbul, would only go as far as Sofia for the time being because of flooding in Bulgaria related to the cold snap.

Top Serbian water official Aleksandar Prodanovic said he hoped for a slow thaw by some five degrees Celsius daily “so the snow melts slowly and causes no bigger problems.”

A quick rise in temperature could trigger floods because of the high levels of snow in Serbia which is up to 1.5 metres in some parts, he told Radio Belgrade.

Bulgarian authorities, who have also banned all navigation on the river, reported the Danube frozen between 50 and 90%, while a total of 224 vessels were stuck in six ports and a river channel in Bulgaria.

In Romania, the river was completely frozen along a 120-kilometre stretch between Moldova Veche and Turnu Severin at the Serbian end, and a further 117 kilometres downstream between Calarasi and Harsova, as well as at Isakcha, in the Danube delta.

Upstream in Hungary, ships were still being allowed on the Danube but “at their own risk” the authorities said, adding that ice was covering between 60-70 per cent of the river.

But in Austria navigation was impossible as the river had an ice layer up to 12 centimetres thick in parts.

“For the Danube to freeze we need temperatures of under minus 10 Celsius for at least a week. That is currently the case,” the river traffic body Via Donau said.