Men dressed in Iraqi federal police uniforms are reported to have tortured and killed residents of villages south of Mosul, Amnesty International says.
Evidence gathered by the group suggests up to six people from the Shura and Qayyarah sub-districts were shot dead after being detained on suspicion of having ties to so-called Islamic State.
The Iraqi federal police has issued a statement denying the accusations.
Pro-government forces launched an offensive to retake Mosul last month.
About 50,000 Iraqi security forces personnel, soldiers, police, Kurdish Peshmerga fighters, Sunni Arab tribesmen and Shia militiamen are involved in the three-week operation.
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Mass graves reveal IS horrors
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The battle for Mosul so far
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On schedule but not exactly to plan
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Satellite images reveal IS barricades



