Riot policemen look behind them toward the site of an explosion, which has been cordoned off, as they stand guard in downtown Urumqi, Xinjiang Uighur Autonomous Region, May 22, 2014 in this photo ... more 
Riot policemen look behind them toward the site of an explosion, which has been cordoned off, as they stand guard in downtown Urumqi, Xinjiang Uighur Autonomous Region, May 22, 2014 in this photo distributed by China's official Xinhua News Agency. REUTERS/Cao Zhiheng/Xinhua less 
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Reuters | Photo By XINHUA / Reuters
Thu, May 22, 2014 5:26 PM EDT