BAGHDAD  —  Suicide bombers detonated explosives on trucks carrying highly toxic chlorine in Fallujah on Wednesday, wounding about 15 U.S. and Iraqi security forces, although the attackers were blocked from reaching government buildings, the American military said.

The chlorine gas attack was the eighth launched since Jan. 28, when a suicide bomber driving a dump truck filled with explosives and a chlorine tank struck a quick-reaction force and Iraqi police in Ramadi, killing 16 people.

The military said Iraqi soldiers and police prevented Wednesday's attackers from setting off the bombs at the Fallujah government center.

The statement did not give a breakdown of how many Iraqi and U.S. forces were wounded. Iraqi soldiers and police were being treated for breathing troubles, nausea, skin irritation and vomiting — symptoms of chlorine gas inhalation.

No U.S. or Iraqi forces were killed, the military said.