Islamic State (Isis) militants have released a brutal video purporting to show the murder of American journalist Steven Sotloff.
It came just two weeks after another video showing the killing of James Foley, his fellow journalist and captive. As well as the killings of Sotloff and Foley, those fighting on behalf of Isis are responsible for thousands of deaths and have been accused of perpetrating massacres and atrocities across Iraq and Syria. They include:
Capturing more than 1,000 Yazidi women, with the apparent intent to marry the younger women. Islamic State militants also raped women when they captured the Iraqi city of Mosul.