An unmanned aircraft dropped explosives on a base belonging to Iran-linked Shi'ite paramilitary groups in northern Iraq on Friday, killing at least one person, the army and paramilitary sources said.
The Iraqi military said in a statement a drone had dropped a grenade onto the base in northern Salahuddin province, wounding at least two people, but gave no further details.
Paramilitary sources in the area and a Baghdad-based paramilitary leader said one person had been killed in the attack, which took place early on Friday.
There was no immediate claim of responsibility.
A security source said two explosions hit the base, one targeting an ammunition depot belonging to an Iran-backed group.
The Pentagon denied that U.S. forces were involved in the attack, after at least one Saudi-based news channel reported U.S. strikes on the base.
The incident took place amid heightened tension between the United States and Iran.
Iraq is seen as a potential arena for any violent regional confrontation between the two foes because of the presence of Iran-backed Shi'ite Muslim paramilitary groups operating in close proximity to bases hosting U.S. forces.