(Reuters) Iraqi security forces and government affiliated militias appear to have unlawfully executed at least 255 prisoners over the past month in apparent revenge for killings by Islamic State fighters, according to a rights group on Saturday.

Human Rights Watch (HRW) said the killings had taken place in six Iraqi towns and villages since June 9 and at least eight of the dead were boys under 18.

In all but one case, the killings took place while the Iraqi forces were fleeing from Islamic State militants and other armed groups, it said on its website.

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