A suspected Tamil rebel suicide bomber killed at least seven troops and one civilian in a blast at a guard post near the Sri Lankan capital on Sunday, AP quoted authorities as saying. Another 17 people, including four civilians, were wounded. Military spokesman Brig. Udaya Nanayakkara said the suicide bomber forced his way into the Civil Defense Force post in Wattala town and blew himself up. Wattala is a few miles (kilometers) north of Colombo. The blast killed six Civil Defense Force officers, one army soldier and a civilian, while another 13 officers and four civilians were wounded, Nanayakkara said. He blamed the Tamil Tigers.