A suicide bomber rammed his explosives-laden vehicle into an army check post in northwest Pakistan Wednesday, killing himself and wounding four soldiers, police said. "It was a suicide bombing. The attacker came in a Pajero jeep and detonated it at the check post," senior police officer Mohammad Alam Shinwari told a foreign news agency. The post in a sensitive garrison area of Bannu town was damaged by the blast, the latest in a series of militant attacks in the country.