There have been reports in the UK that Iranian fighter jets have been deployed to help Iraq in its offensive against Islamist group ISIS.
Russia has already supplied Baghdad with aircraft.
This latest development means that the United States, which has also sent drones and helicopters to Iraq, is operating alongside Iran in the conflict.
Washington has so far pledged 300 mainly special forces advisers to help in the battle against the spread of the Islamist militants in the country. On Monday they said they would send a further 300 troops to help secure the embassy and Baghdad Airport.
Fighting has been reported in several areas including in the city of Tikrit.
In the Kurdish autonomous region displaced civilians have started to depart for Turkey.
The bus terminals in the city of Erbil and other towns have been full with people trying to leave the region.
It’s also been reported that hotels in the area are full.