Security forces have raided the farm of prominent Sunni tribal leader Sheikh Ali Hatem al-Suleiman, seeking to arrest him.
Al-Suleiman, emir of the Dulaim tribes, has been instrumental in setting up the "Army of Pride and Dignity", a tribal force in Ramadi and elsewhere in Anbar Province, west of Baghdad.
The emir said that dozens of Army of Pride and Dignity members later tracked down the Iraqi army convoy that conducted the raid and clashed with it, freeing three farmers who had been seized.
"This is it; enough is enough. We will attack every Iraqi army checkpoint in Anbar if they don't withdraw from Anbar province immediately," Al-Suleiman said. "We will not accept any talks or negotiations with the government anymore."