A suicide bomber was killed in a failed attack on a convoy of U.S.-led coalition forces Thursday after his car loaded with explosives failed to detonate, an Afghan official said.

Coalition forces killed the attacker when he got out of the car and threw grenades at a jeep in the convoy, said Obaidullah Khan, chief of the district in southern Afghanistan's Kandahar province, where the attack occurred.

No coalition troops were hurt, Khan said.