Edraak said there had been 17 avalanches reported so far and more than 200 trucks, buses and cars were trapped inside the tunnel, which made the rescue operation more difficult.
Heavy snowfall and rain also caused floods in the south of the country. Zalmay Ayoubi, spokesman for the governor of southern Kandahar Province, said six people had been killed and 10 were missing as a result of floods.
(Reporting and Writing by Hamid Shalizi; Editing by Nick Macfie and Alex Richardson)