A gas explosion in a coal mine in Jixi city in northeast China's Heilongjiang province Sunday killed 10 people, media reported.Rescuers retrieved the bodies of the victims from the Xingyun colliery in Jidong County, Xinhua reported, citing a statement from the provincial production safety supervision and administration bureau.The victims were reportedly trapped underground after the explosion.The explosion occurred at 10.10 a.m. Sunday. The cause of the accident is being investigated.