"Eight people -- a senior intelligence official, five policemen and a woman -- were killed by a US strike on the centre of Al-Baghdadi," a town in western Iraq, the official said, asking not to be identified.
"It seems the strike was a mistake," the official said of the incident in the Euphrates Valley town, adjacent to the Ain al-Asad airbase 250 kilometres west of the capital.
The dead were travelling in a convoy which had been deployed to support an operation against suspected Islamic State group militants in the area.
Iraq's Joint Operations Command, which coordinates the campaign against IS, said it had ordered a special forces raid in the town after receiving intelligence of a "meeting to be attended by terrorist commander Karim al-Samarmad".
It said it had requested "air support from the international coalition".
"Once the terrorist was arrested and while troops were carrying out searches, a grenade was thrown from an adjacent building."
As the special forces troops returned to base, they ran into a convoy of police and paramilitaries of the Hashed al- Shaabi auxiliary force that had been sent to support them.
"An inquiry has been opened.
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