Iran's Foreign Ministry spokeswoman has denied a report that said Tehran agreed to cooperate with Washington to fight ISIL Takfiri militants in Iraq, PressTV reported.
On Friday, Marzieh Afkham rejected a BBC report which said Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei had "authorized his top commander to coordinate military operations with the United States."
Afkham said the report, in which the BBC has cited unknown sources, is not correct.
The US has also announced that there is no plan for coordination with Iran on fighting the ISIL.
Tehran has time and again voiced support for the Iraqi government, since it began fighting against the militants in June.
Iran has also criticized Washington for conducting airstrikes on the ISIL only after US interests were threatened by the militants.
The ISIL controls large swathes of Syria's northern territory. The group sent its members into neighboring Iraq in June and seized large parts of land there in a lightening advance.
The terrorists have committed heinous crimes and threatened all communities, including Shias, Sunnis, Kurds, Christians and Izadi Kurds, during their advances in Iraq.
Senior Iraqi officials have blamed Saudi Arabia, Qatar and some Persian Gulf Arab states for the growing terrorism in their country.