Four members of Iraqs military were wounded Sunday in a rocket attack targeting an air base just north of Baghdad which houses American trainers, Iraqi security officials said. The attack by at least six rockets came just days after Iran fired ballistic missiles at two bases in Iraq that house US forces, causing no casualties. Sunday’s attack wounded an Iraqi air force officer and three enlisted men, Iraqi security officials said. The rockets struck Balad air base, which hosts American trainers, advisers and a company that provides maintenance services for F-16 aircraft. Some rockets fell on a restaurant inside the airbase, the officials said. The base is located some 80 kilometers north of Baghdad. A statement from the Iraqi armys official media office confirmed the attack but said eight rockets hit the base, and that two officers had been wounded. The difference in accounts could not immediately be reconciled. “There are American experts, trainers and advisers at the base,” said one defense official.