Police officers check the vehicle after a grenade attack in Mombasa, Kenya, Wednesday Aug. 29, 2012. The attack wounded four policemen in the latest outbreak of violence in Kenya's coastal city of Mombasa, ending what had seemed to be a lull in violence stemming from the killing on Monday of a radical Islamist preacher, a police officer said late Monday. A hand grenade was hurled into a police van carrying several security officials who were patrolling the precincts of Mombasa Pentecostal Church, critically wounding three of them, police officer Kipkemboi Rop said. The grenade attack shattered the relative calm that had started to spread over the city on the third day after the killing of Muslim cleric Aboud Rogo Mohammed. (AP Photo/Sayyid Azim)