The death toll from a gas explosion in a coal mine in Heilongjiang province in northeast China has risen to 104.

This is China 's worst mining accident since the December-2007 accident, which killed 105 miners in coal-rich Shanxi province.

By early morning of November 25 there were still four miners trapped in the mine, according to the Xinhua News Agency.

A total of 528 miners were working underground at the time when the blast ripped through the Xinxiang Coal Mine in Hegang city at around 2:30 a.m. on November 21.

Xinhua said that 420 miners managed to escape.

The mine, located over 400 kilometres east of the provincial capital Harbin, has an annual production capacity of 1.45 million tonnes, said Xinhua.

Statistics from China show that since 2007, mining accidents have resulted in 3,800 fatalities./.