Pentagon is aware of the attacks and is not concerned as it is a local matter.
Via Haaretz
The Iranian Air Force is bombing Islamic State (ISIS) targets inside Iraqi territory. It is an intensification of Iran’s military involvement on the side of the Shia regime of its neighbor and most likely also a sign of its alleged coordination with the U.S. military which is leading the international coalition fighting ISIS.
The first footage of an Iranian aircraft bombing inside Iraq was broadcast by Al Jazeera a few days ago in a report on a joint operation by the Kurdish Peshmerga forces, Iraq’s army and Shia militias to recapture two Kurdish towns in northeastern Iraq, near the Iranian border. The report mentions “Iraqi jet-fighters,” but the plane seen bombing ISIS positions is a F-4 Phantom, which is not in Iraqi service.
The venerable Phantom which first entered service in 1960 (and was retired by the U.S. Air Force in the 1990s and Israel in 2004) still flies with two air-forces in the region, Turkey and Iran. The Phantom’s markings are not visible in the Al Jazeera footage but since Turkey has so far refused to militarily aid the Kurds fighting across the border and the proximity to Iran, it is almost certainly an Iranian fighter.