ATTENTION EDITORS – REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE CONTENT OF THE VIDEO, WHICH WAS OBTAINED FROM A SOCIAL MEDIA WEBSITE, THAT THIS STILL IMAGE WAS TAKEN FROM

A still image from an amateur video posted on a social media website purports to show Syrian rebels sitting on the ground before their public execution by Al Qaeda-linked militants from the Islamic State in Iraq and the Levant (ISIL) at a location said to be Atarib, Idlib Province November 27, 2013. Al Qaeda-linked militants have executed the commander of a rival rebel faction and six of his men, an amateur video of the public execution showed, part of their campaign to marginalise other groups. The 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. REUTERS/Social Media Website/via Reuters TV (SYRIA – Tags: CONFLICT) ATTENTION EDITORS – THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO SALES. NO ARCHIVES. THIS IMAGE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS