The UN Security Council has been asked to look into allegations that the Islamic State is using organ harvesting to finance its operations.
Mohamed Alhakim, Iraq’s ambassador to the United Nations told reporters that in the past few weeks, bodies with surgical incisions and missing kidneys or other body parts have been found in shallow mass graves.
"We have bodies. Come and examine them," he said. "It is clear they are missing certain parts."
Members of the Kurdish forces view remains of Yazidis killed by IS on 3 February
He also said a dozen doctors have been "executed" in Mosul for refusing to participate in organ harvesting.
Alhakim briefed the council on the overall situation in Iraq and accused the Islamic State group of "crimes of genocide" in targeting certain ethnic groups.
The outgoing U.N. envoy to Iraq, Nikolay Mladenov, told the council that 790 people were killed in January alone by terrorism and armed conflict.
Mladenov noted the increasing number of reports and allegations that IS is using organ harvesting as a financing method, but he said only that "it's very clear that the tactics IS is using expand by the day."
He said Iraq's most pressing goal is to win back the vast territory that IS has seized in the past year.
The Sunni militants seized a third of both Iraq and neighboring Syria and imposed strict Sharia law.
"Especially worrying is the increasing number of reports of revenge attacks committed particularly against members of the Sunni community in areas liberated from ISIL control," Mladenov said.