The comments by spokesman Admiral John Kirby marked the US government's first public confirmation that Iranian operatives had crossed into Iraq, where the Baghdad government is struggling to counter the swift advance of Sunni extremists.
"There are some Iranian revolutionary operatives in Iraq but I've seen no indication of ground forces or major units," Kirby told a news conference, apparently referring to Tehran's Quds force, the covert arm of the Revolutionary Guard Corps.
"Their interference in Iraq is nothing new," Kirby said.
But the United States and Iran now find themselves sharing a common interest in helping Iraqi Prime Minister Nuri al-Maliki fend off the onslaught by Sunni militants from the Islamic State of Iraq and the Levant (ISIL).
The Pentagon offered no further details on the nature of the Iranians' presence or their operations, amid media reports that Tehran had launched a concerted effort to shore up Iraqi forces.
"We have indications that there are at least some operatives inside Iraq," he said, saying the alleged deployment amounted to "small numbers" of agents.
Some Iraqi army and police units have collapsed against the ISIL fighters, in some cases ditching their uniforms and weapons before fleeing.
The rapid offensive by ISIL, which has overrun swathes of northern and central Iraq, has alarmed Tehran -- which has close ties to the Maliki government -- as well as Washington.
Western diplomats say Qassem Suleimani, commander of the Quds Force, has travelled to Baghdad to advise Maliki in the crisis.
President Barack Obama announced yesterday plans to send up to 300 US military advisers to Iraq but stopped short of ordering air strikes against ISIL forces, though he left the door open to that possibility.
Iran Deputy Foreign Minister Hossein Amir Abdollahian dismissed the move as evidence that Obama lacked "serious will" to fight terrorism.
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