China mine blast kills 20 and leaves 17 trapped

An explosion at a coal mine in central China has killed 20 miners and trapped another 17 underground.

Rescue efforts are underway at the the pit in Yuzhou, Henan province, which state media said had been hit by a "sudden coal and gas outburst".

China's mining industry is the most dangerous in the world - more than 2,600 were killed in accidents in 2009.

Ashleigh Nghiem reports.