The US-led coalition has begun surveillance flights over the Islamic State-held city of Tikrit and offering intelligence to the Iraqi forces trying to take it, an official has revealed.
He said air support began on Saturday at the request of the Iraqi government.
The spokesman would not say whether this support includes air strikes.
Iraqi security forces, backed by Iranian-supported Shia militias, have launched a large-scale offensive to recapture Tikrit, Saddam Hussein’s home town, earlier this month.
The US has previously said the Iraqi government did not ask them to participate in the campaign.