Bulgarian river supervision authorities said shallow waters, coupled with the freezing of the river, poses risks to ships, reported Reuters, which did not mention when the ban would be lifted.
Severe frosts and snow storms killed dozens of people in central Europe over the weekend, mainly in Poland, as temperatures plunged below minus -30 degrees Celsius in some areas.
Severe frosts and snow storms killed dozens of people in central Europe over the weekend, mainly in Poland, as temperatures plunged below minus -30 degrees Celsius in some areas.