The men were convicted in a mass terrorism trial, a case that activists have decried and that UN human rights experts had expressed concerns over.
Iraqi security forces have forcibly relocated at least 170 families of the alleged militants as a form of collective punishment, says Human Rights Watch.
The UN agency's latest warning comes as fighting intensifies in western Mosul amid allegations that the Iraqi army has used white phosphorus in Daesh-controlled areas.
US troops have been training the Iraqi forces in the fight against Daesh, which has lately been losing ground both in Iraq and Syria.
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