Aug 4 - Chinese police say a grenade assault that killed 16 police in restive western Xinjiang region on Monday was a "suspected terrorist" attack. The violence comes four days ahead of the opening ceremony for the Beijing Olympic Games. The Xinhua news agency said two assailants drove a truck towards exercising border police officers in Kashgar, home of many Muslim Uighur people resentful of Chinese control on the region. Despite the attack, authorities say Beijing will be safe for the Games. Andrew Potter reports.