Within an hour of each other, suicide bombers striking police positions in northern and western Iraq on Thursday killed six officers and wounded eight others, Iraqi authorities reported. In the first attack, around 9 a.m., a suicide bomber blew up his explosives-laden truck at a police station in Rabia, near Iraq's border with Syria, killing at least three policemen and wounding four others, an Iraqi army spokesman said. A guard shot the driver as he approached the building, but the truck still penetrated its blast walls and exploded, destroying the one-story structure, said Capt. Mohammed Ahmed of the army's Third Division. Rabia is 90 kilometers west of Mosul and about 5 kilometers from Syria. Around 10 a.m., in Ramadi, 115 kilometers west of Baghdad, three policemen were killed and four others wounded when a suicide driver blew up his automobile at their checkpoint, police said. The post was just 50 meters from the traffic police headquarters, said a police officer, speaking on condition of anonymity since he wasn't authorized to talk to the media.