Twenty-one miners were killed after a gas explosion in a coal mine early on Friday in northwest China's Xinjiang Uygur Autonomous Region, regional emergency response office said. The office said earlier that 22 miners were trapped in the mine following the explosion. Only one survived. The blast happened at 1:26 a.m. at the Baiyanggou coal mine in Hutubi County in Hui Autonomous Prefecture of Changji, when 34 miners were working underground, Xinhua quoted the prefecture government as saying. Twelve workers managed to escape. Professional coal mine rescue teams and firefighters had been sent to the site, according to the regional bureau of coal mine safety supervision.