Suspected militants attacked a security checkpoint in northwestern Pakistan on Wednesday, abducting 18 police officers and injuring two others, officials said. The insurgents fired rockets at the post near Bannu, a town next to the restive region bordering Afghanistan, before overrunning the position. The Associated Press quoted army spokesman Major Gen. Waheed Arshad as saying that the militants abducted 18 police officers and left behind two others injured in the attack. He gave no more details.