About 200 policemen reside here,??? Khan said.The attack came a day after a car bomb ripped through a bus -station on the outskirts of Peshawar, killing 13 people, including two children, raising concerns about a new wave of violence in the city of 2.5 million.More than 530 bomb attacks have killed around 4,900 people across Pakistan since government troops in July 2007 stormed a mosque in Islamab