In a series of explosions at an open-air market in Urumqi, capital of China's restive Xinjiang province an 31 people were killed and 90 injured .

Media reports said two cross-country vehicles ploughed into people in the market today morning and explosives were thrown out of the cars, one of which exploded.

It said unknown number of people were killed and injured.

Xinjiang, bordering Pakistan-occupied Kashmir and Afghanistan, has been plagued by violence for years.

The region has witnessed riots between native Muslim Uygurs and Han settlers from outside the province.