At least six people died in two clashes between police and ethnic Uighurs, in the latest sign of unrest in China's far western region of Xinjiang, US-based Radio Free Asia said on Thursday, according to dpa. Police in southern Xinjiang's Shufu, or Konasheher, county in Kashgar prefecture opened fire after a group of Uighur men stabbed to death an officer following a security check last week, the broadcaster's Uighur-language service reported. Four Uighurs died in the clash. Another Uighur man was shot dead in an earlier incident as he fled from police in Awat county in neighbouring Aksu prefecture, it said.