The United States has indications that Iran has carried out air strikes on Islamic State targets in Iraq in recent days, US officials said on Wednesday.
A senior Iranian official denied that Iran had launched any such strikes.
US officials, speaking on condition of anonymity, said the United States had indications that Iran had used F-4 Phantoms to launch the raids in the last several days.
An Iraqi security expert said the strikes took place 10 days ago near the Iranian border.