A suicide bomber killed himself and wounded two policemen in northwestern Pakistan on Friday in the latest attack targeting security forces since last month's deadly army air raid on a religious school, the Associated Press (AP) reported. The attacker, believed aged 19, detonated his explosives near a police pick-up truck parked at a busy crossroads in Pishta Khara, on the southern outskirts of Peshawar, a major city near the Afghan border, said Supt. Iftikhar Khan, a senior police officer in the area. There was no immediate claim of responsibility for the blast, which shattered the windows of the police vehicle and damaged a nearby police post. The two policemen were not seriously hurt.