The monthly death toll was the highest since September, and the rise from last month appeared to be almost entirely due to higher casualties among security forces.

Some 800 Iraqi security forces and pro-government militiamen were killed in June, more than twice the 366 killed in May, according to the figures.

The UN mission said those killed in June include at least 665 civilians. It put the total number of wounded at 1,687. Baghdad was the worst-affected province, with 324 civilians killed and 650 wounded.

The United Nations said the figures are an ‘‘absolute minimum’’ as it has not been able verify all causes of death in conflict zones or count those who have died from the secondary effects of violence after fleeing their homes.

‘‘Terrorists of the so-called ISIL are largely responsible for this violence that has affected all aspects of life in Iraq,’’ UN envoy Jan Kubis said.