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People wait outside of the Xinxing Coal Mine after a gas outburst accident in Hegang City in this video frame grab from CCTV footage. 

Relatives of miners gather at the Xinxing Coal Mine after a gas outburst accident in Hegang City, in northeast China's Heilongjiang Province, November 21, 2009. [Xinhua]

Glasses windows were shattered by the blast. [Xinhua]