KIRKUK, Iraq — Police and security units, forces led by Kurdish political parties and backed by the U.S. military, have abducted hundreds of minority Arabs and Turkmens in this intensely volatile city and spirited them to prisons in Kurdish-held northern Iraq, according to U.S. and Iraqi officials, government documents and families of the victims.

Seized off the streets of Kirkuk or in joint U.S.-Iraqi raids, the men have been transferred secretly and in violation of Iraqi law to prisons in the Kurdish cities of Irbil and Sulaymaniyah, sometimes with the knowledge of U.S. forces. The detainees, including merchants, members of tribal families and soldiers, have often remained missing for months; some have been tortured, according to released prisoners and the Kirkuk police chief.

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