Following news reports and statements from the Pentagon, Iranian officials on Wednesday denied accusations that its military has been involved in airstrikes against Islamic State targets inside Iraq.

"Iran has never been involved in any air strikes against the Daesh (Islamic State) targets in Iraq. Any cooperation in such strikes with America is also out of question for Iran," a senior Iranian official told Reuters on condition of anonymity.

The counter-claim from Tehran followed reporting indicating Iranian fighter planes had conducted missions inside Iraq and subsequent comments from Pentagon chief spokesperson Rear Admiral John Kirby who said at a briefing on Tuesday that there were "indications" the Iranians "have flown these missions in recent days in eastern Iraq."

Kirby who tried to make it clear that if such bombings have taken place, they were done so without coordination from U.S. forces.

“Nothing has changed about our policy of not coordinating military activity with the Iranians,” Kirby told reporters.

The Guardian reports:

In Tehran, the deputy chief of staff of Iran’s armed forces, Brigadier-General Massoud Jazayeri also denied any collaboration. Iran considered the US responsible for Iraq’s “unrest and problems”, he said, adding that the US would “definitely not have a place in the future of that country”.

Kirby’s comments followed reports that American-made F4 Phantom jets from the Iranian air force had been targeting Isis positions in Diyala. It had earlier been reported that Iran sent three Su-25 fighter jets to Iraq designed for close support of ground troops and that Iranian pilots flew Iraqi aircraft on combat missions.

Al-Jazeera adds:

The onslaught of ISIL in Iraq has forged an unlikely alignment between Iran and the US, which have been locked in a cold war for more than three decades.

The fight against the ISIL has come amid a US diplomatic drive to agree a deal with Iran over its nuclear programme, and officials acknowledge the two sides have discussed the war in Iraq on the margins of the nuclear talks.

However, the US and Iran remain deeply opposed over Syria, with Iran providing crucial military backing for President Bashar al-Assad while the US has pledged to train a moderate rebel force to eventually confront the Assad government.