The US military has announced it is hoping to arrange a ceasefire with fighters of the Iranian opposition Mujahideen i-Khalq movement it has been attacking over the last few days.
"We know that there's a presence of the Mujahideen i-Khalq inside of Iraq and indeed we have been targeting them for some time," Brigadier General Vincent Brooks told a briefing at Central Command headquarters in Qatar on Thursday.
"There's work that's ongoing right now to try to secure some sort of agreement that would be a ceasefire and capitulation. That work is ongoing and it will most likely unfold within the coming days."
Armed with tanks and artillery, the Mujahideen have sought to overthrow Iran's Islamic government for more than a decade. The group is also known as the People's Mujahideen Organisation of Iran.
The New York Times newspaper quoted unnamed U.S. government officials as saying the group had supported Saddam Hussein and was regarded as a legitimate military target.
The US government estimated recently that the group had "several thousand fighters", most of whom are based in Iraq.
An American defence official said on Wednesday US forces were still pursuing various paramilitary and other opposition groups based inside Iraq.