A bomb ripped through a police van as it was patrolling in northwestern Pakistan on Monday, killing two officers and wounding two others, police said. The attack took place on the outskirts of the city of Peshawar, according to a report of the Associated Press. It's unclear if the blast was caused by a roadside bomb or a suicide bomber, said senior police officer Javed Khan. The bombing completely destroyed the police van that was hit, he said.