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
 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.




 

















