At least 20 people were killed when a "reckless" bus driver veered off the road and plunged into a river in northwest Iran.
The official IRNA news agency quoted police sources as saying 11 injured people were rushed to hospital in the city of Sanandaj in the province of Kurdistan that straddles the Iraqi border.
Iran has one of the world's highest road accident rates.
IRNA has reported that almost 22,000 people were killed on the Islamic Republic's roads in the year that ended in March.
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Iran's newspapers frequently criticise Roads and Transport Minister Ahmad Khorram over the nation's accident-plagued highways that they say are ill-maintained.