Islamic State of Iraq and Greater Syria (ISIS) fighters reportedly killed up to 670 prisoners in Mosul and committed other horrific abuses in Iraq that amount to crimes against humanity, U.N. High Commissioner for Human Rights Navi Pillay said Monday.

The U.N. mission in Iraq has also verified reports of a massacre of prisoners and detainees from Mosul's Badoush Prison on June 10, she said. Interviews with 20 survivors and 16 witnesses described ISIS gunmen loading between 1,000 and 1,500 prisoners onto trucks and driving them to a nearby uninhabited area.

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