Chinese policemen stand by a roadblock set up at the junction to the street market where two off-road vehicles drove into a crowd, with one of them exploding, in Urumqi, farwest China's Xinjiang region on May 23, 2014. Attackers killed at least 31 people on May 22 when they ploughed two vehicles into a market and threw explosives in the capital of China's Xinjiang region, in what authorities called the latest "severe terrorist incident" to hit the Muslim Uighur homeland.. AFP PHOTO/GOH CHAI HIN (Photo credit should read GOH CHAI HIN/AFP/Getty Images)
