The U.S. military tightened security around its civilian facilities in South Korea on Friday after radicals attacked an American housing compound with firebombs and iron pipes.

A U.S. military spokesman would not be specific about the security measures. He said U.S. Army headquarters were still on the alert imposed during the Olympics that included routine identification checks and spot-checks of cars.U.S. Army commander Gen. Louis Menetrey condemned Thursday night's attack, which the army said caused more than $13,000 worth of damage to cars and slightly injured two American soldiers.