A suicide bomber rammed his explosives-laden vehicle into a police building in Peshawar in northwest Pakistan on Wednesday, killing at least two policemen and injuring 18 other people. Officials said, the building on University Road, which houses the office of the Criminal Investigation Department, was destroyed by the powerful blast. Senior Khyber-Pakhtunkhwa Minister Bashir Bilour confirmed that the attack was carried out by a suicide car bomber. He said, about 300 kg of explosives was used in the attack. Police and rescue workers said several policemen could be buried in the rubble of the building, whose walls and ceiling collapsed after the blast. Army soldiers and policemen cordoned off the area and sealed the University Road. No group claimed responsibility for the attack.