BEIJING (AFP) - Chinese police killed six people and arrested three others during a clash in the restive Muslim northwest region of Xinjiang, state media reported on Saturday. Police carried out an operation late Friday in Kashgar prefecture in the far west of Xinjiang against a group of people suspected of involvement in an attack on August 12 in which three security guards were killed, the Xinhua and China News agencies said. They discovered the nine suspects armed with knives in a cornfield, where they resisted arrest and injured two members of the security forces, the agencies said. The police fought back, killing six of the suspects and wounding the three others. Local police contacted by AFP Saturday refused to comment on the reported clash in the remote region which borders Central Asia.