Four miners were killed when a coal mine roof collapsed in northern China\'s Shanxi province, authorities said Sunday. The accident happened around 1 p.m. Sunday in the Beiyu Coal Mine in Puxian county in the city of Linfen, Xinhua reported. Seven miners were trapped in the shaft, said a spokesman with the county government. Rescuers were searching for the remaining three miners, the news agency said. Beiyu Coal Mine is owned by Shanxi Puxian County Hongyuan Group.