A suicide car bomber killed at least 13 Iraqi soldiers and wounded dozens more Sunday in Iraq's north. Meanwhile, the U.S.-protected Green Zone in Baghdad came under fire from either mortars or rockets, and a round that fell short injured two bystanders, the Associated Press reported. Iraqi security forces opened fire on the bomber as he drove toward the military base in the northwestern city of Mosul but were unable to foil the attack because the truck's windshield had been made bulletproof. The attacker blasted past an armored vehicle to reach the courtyard of the military headquarters, according to an Iraqi army officer, who spoke on condition of anonymity because he wasn't authorized to release the information. Police said at least 13 Iraqi soldiers were killed and 42 people wounded _ 30 soldiers and 12 civilians _ in the attack. Extremists were suspected to be behind the barrages against the Green Zone, which houses the U.S. and British embassies and the Iraqi government headquarters. About 10 detonations were heard starting shortly before 6 a.m in the sprawling area in central Baghdad. Several other mortars or rockets slammed into the area about four hours later. The U.S. public address system in the Green Zone warned people to «duck and cover» and to stay away from windows following both attacks. No casualties were reported inside the Green Zone, a frequent target of rocket and mortar attacks that is located on the west bank of the Tigris River. But one round fell short and exploded in a major traffic circle on the east side of the river, injuring two people nearby, police said.