BEIJING, Jan 5 (Reuters) - At least 13 people were killed when a bus in which they were travelling plunged into a valley in southwest China's mountainous Guizhou province, Xinhua news agency said on Monday.

The bus carrying 44 people veered off a highway in Guizhou's Yanhe county to fall into an 80-metre (260-ft) deep ravine, the agency said. It was not clear how many were injured.

China's roads are the deadliest in the world, with overtaking on blind mountain corners common. Road accidents killed 73,484 last year, according to the Ministry of Public Security's website. (Reporting by Yu Le; Editing by Sanjeev Miglani)

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