Iraq: Images purport to show 'massacre' by militants
15 June 2014 Last updated at 23:19 BST
The Sunni extremist group that has taken territory across Iraq has released video and photos that appear to show its fighters preparing to massacre Iraqi soldiers.
An Iraqi military spokesman said the pictures posted online by the Islamic State in Iraq and the Levant (ISIS) were authentic and depicted events in Salahuddin province.
John Simpson reports from Baghdad.