Rescuers are seen at a gas explosion accident site at the Yangjiagou coal mine in Hutubi county of Northwest China's Xinjiang Uygur autonomous region, Dec 13, 2013. The explosion occurred at 1:26 am when 34 miners were working underground. Twelve workers managed to escape themselves. Among the trapped twenty two workers, twenty one were confirmed dead, said the region's emergency response office. [Photo/Xinhua]