File photo: VCG

HARBIN, Nov. 4 (Xinhua) -- A coal mine cave-in in northeast China's Heilongjiang Province trapped seven people on Monday, local authorities said.
The collapse occurred on Monday morning at a mine owned by the Longmei Mining Holding Group's subsidiary in Shuangyashan, a city of Heilongjiang Province, according to the sources with the municipal government.
Rescue work is underway.