These are the other atrocities committed by Isis

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: