Thirteen people died and 32 others were injured when a Romanian bus carrying some 46 passengers crashed in a Montenegro gorge on Sunday, Interior Minister Rasko Konjevic said.

"In an extremely serious accident, 13 people were killed and 32 injured, seven of them in a life-threatening condition," Konjevic told reporters at the scene of the crash.

Konjevic clarified that the bus had Romanian and not Ukrainian licence plates, as previously reported by the police.

The identities or nationalities of the victims have not yet been revealed.