Al Qaeda militants have been filmed executing seven men from a rival rebel Syrian faction as part of a campaign to marginalise other moderate groups in the civil war.
The amateur video, apparently taken on a mobile phone, shows the men kneeling on the ground before each one is shot in the head and slumps forward onto the ground.
The Islamic State in Iraq and the Levant, or ISIL, fighting to overthrow President Bashar al-Assad, have taken advantage of a power vacuum in rebel-held areas to assert its authority over more moderate elements of the armed opposition.
