Sofia, Nov 30 (DPA) A Cambodian-flagged freighter sank after a collision with a Dutch tanker in the Black Sea Monday, leaving six crewmembers unaccounted for, the Bulgarian news agency BTA reported.

The Karim 1 went down during stormy weather off Cape Emine in Bulgaria. Four of its 10-member crew were rescued, all but one of them from Syria.

The freighter was on its way to Istanbul. The tanker, which did not have any cargo, was travelling to the Bulgarian port of Varna.

Varna was closed to shipping earlier Monday because of gale-force winds.