Death toll from the deadly coal mine blast in northeast China's Heilongjiang Province has risen to 87 as of 7 a.m. Sunday, said local authorities.

Another 21 are still trapped in the shaft.

The blast happened at around 2:30 a.m. Saturday at the Xinxing Coal Mine under the state-owned Heilongjiang Longmei Mining Holding Group's subsidiary in Hegang City. A total of 528 miners were working underground, among whom 420 have escaped the accident, said staff with the company.