GENEVA — Islamic State extremists have carried out scores of execution-style killings in Iraq this month, the United Nations said on Tuesday, reporting “cruel and inhuman” punishment of men, women and children in areas under their control.

Two men believed to be members of the Islamic State, also known as ISIS or ISIL, who were accused of banditry, were tied by their arms to a cross and then shot in the northern city of Mosul; two other men who had been accused of homosexual acts were thrown off a rooftop in the city after a summary hearing by an ad hoc court, the United Nations human rights office said.

Their “ruthless murder” provided “another terrible example of the kind of monstrous disregard for human life that characterizes ISIL’s reign of terror over areas of Iraq that are under the group’s control,” the United Nations said.