The Islamic State jihadist group on Sunday posted a video claiming responsibility for the beheadings of a Syrian anti-ISIS activist and his friend in southern Turkey last week.
The video posted online said ISIS "slaughtered" Ibrahim Abdul Qader, 20, and fellow media activist Fares Hamadi in Sanliurfa on Friday "after they conspired with the Crusaders against the Islamic State."
Abdul Qader had been working with the Raqa is Being Slaughtered Silently activist group, which sheds light on ISIS atrocities in areas under jihadist control in Syria.
"May every apostate know that he will be slaughtered silently," the video said, in an apparent reference to the group's title.
The video then displayed a series of news reports about the RBSS group and its anti-ISIS activities.