Suspected militants targeted a police vehicle and a security checkpoint with bombs in northwest Pakistan on Thursday, killing four officers and wounding nine others, police said. According to AO, three policemen were killed in the first attack when a remote-controlled bomb destroyed a vehicle carrying police and paramilitary forces in Bannu district of troubled Khyber Pukhtunkhwa province, said Rafique Khan, a local police official. Five security personnel were also wounded in the attack, said Khan, who blamed local militants but offered no evidence to back up his claim. Also Thursday, a bomb ripped through a checkpoint manned by tribal police in Bara, a town near the northwestern city of Peshawar, killing one officer and wounding four others, police official Iqbal Khan said.