One more person was confirmed missing from Thursday's colliery gas blast in northeastern Heilongjiang Province, bringing the number of the missing to 10, according to local government.

Zhao Deshuang, a manager of the coal mine who went down into the mine tunnels to check the situation of the miners after the gas blast, was also missing, the rescue headquarters for the gas blast said on Friday.

The gas blast has also caused flooding in the mine, which hampered the rescue operation, said an official with rescue headquarters who declined to give his name.

The accident happened at around 5:10 a.m. Thursday in the Baoxing Coal Mine in Fangzheng County, when 28 miners was carrying out routine tunnel maintaining work. Nineteen escaped while nine others were missing.

Liu Haisheng, vice governor of Heilongjiang, rushed to the site to supervise the rescue operation.

Cause of the accident is being investigated.