China ? Attackers hurled homemade bombs at government buildings in western China today, wounding three officers, state media said, amid tightened security following an attack days before the Beijing Olympics opened and threats by a militant group to disrupt the Summer Games.

It was unclear how many assailants were involved in the pre-dawn explosions in Kuqa, a county in the restive Muslim region of Xinjiang, but the official Xinhua News Agency said police shot dead five of the suspects.

The bombings are the second attack in Xinjiang in a week. Two men last Monday rammed a truck and threw explosives at paramilitary police, killing 16.