A passenger bus in Cambodia has crashed off a bridge into a river, killing at least 13 passengers and injuring two dozen others, police say.

The bus was travelling from Siem Reap, home to the country's fabled Angkor Wat temple complex, to the capital Phnom Penh when it crashed in the pre-dawn hours in the central province of Kampong Thom, the deputy police chief for the area, Siv Sovanna, told the Associated Press by phone.

All those on the bus were Cambodian citizens, he said.

A preliminary investigation suggested that the driver had been drowsy after his night time departure from Siem Reap, for what is normally about a five and a half hour trip, Siv Sovanna said.

He did not say if the driver was among the dead.

There were believed to have been about 40 passengers who boarded the bus

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