"Widespread human rights violations and massive displacement continue unabated throughout the country," said the report, compiled by the UN Assistance Mission for Iraq (UNAMI) and the Office of the High Commissioner for Human Rights (OHCHR).
The report is based on investigations on the ground and testimonies from victims and witnesses, including internally displaced people, the UN said.
"Widespread human rights violations and killings of civilians continue unabated in Iraq," it said.
The report indicated that the situation of civilians in areas under the control of the Daesh remained dire.
"Civilians continued to be murdered, often in grim public spectacles," the report said.
Noting ethnic and religious communities in Daesh-controlled areas continue to be persecuted, the report said, adding about 3,500 members of the Yezidi community remained in Daesh captivity.
According to the International Organization for Migration (IOM), more than 3 million Iraqis have been displaced due to conflicts in the country from January 2014 through June 2015.
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