Four dead, more trapped in collapsed mine SHENYANG, China, May 21 (UPI) -- The roof of a colliery collapsed in China's Liaoning province, leaving four miners dead and five more trapped, authorities said Monday. Twelve miners were working when the incident occurred at 11 a.m. Sunday in the Qingshui No. 2 Colliery in Qingshuitai, Xinhua reported. Three people had been lifted out as of 11 a.m. Monday and the rescue work is still under way, said a press release from the provincial coal mine safety supervisory bureau. The coal mine belongs to Shenyang Coking Coal LLC, a subsidiary of the state-owned Shenyang Coal Trade Group Corp. The cause of the incident was under investigation.