KASHGAR - A group of religious extremists led by culprits trained in overseas terrorist camps were behind the weekend attack on civilians in China's far-western Xinjiang Uygur autonomous region that left 6 dead and 15 others wounded, the local government said Monday.

Initial probe has shown that the heads of the group had learned skills of making explosives and firearms in overseas camps of the terrorist group "East Turkistan Islamic Movement" (ETIM) in Pakistan before entering Xinjiang to organize terrorist activities, the Kashgar municipal government said in an online statement.

Six civilians were killed, 15 others - including three policemen - were injured after attackers set fire on a restaurant and started a killing rampage on civilians in Kashgar. Five suspects were shot dead by police.