Islamic State insurgents in Iraq have carried out mass executions, abducted women and girls as sex slaves, and used child soldiers in what may amount to systematic war crimes, the UN said.

A top Serb official said today that Serbian authorities had the political will to arrest former Bosnian Serb army commander Ratko Mladic and hand him over to a UN tribunal.

A Croatian army general flew to the Netherlands today to surrender to the UN war crimes tribunal and face charges that he oversaw a wartime campaign that left dozens of Serbs slain and their homes reduced to ashes.