BEIJING, Feb 19 (Reuters) - A bus crashed into the back of a tanker, causing an explosion that engulfed three other vehicles already involved in an accident in southern China, killing 15 people, the official Xinhua news agency said on Tuesday.

The accident happened on Monday in Chenzhou in Hunan province, which had been heavily hit by unusually cold weather and snow, the report said.

A further 25 people were injured.

"All the injured are being treated in hospital," Xinhua said.

It provided no other details. (Reporting by Ben Blanchard, editing by Ken Wills and Sanjeev Miglani)

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