BEIRUT (AFP) - A Syrian activist who produced documentaries hostile to the Islamic State group was assassinated in Turkey on Sunday (Dec 27), according to the group with which he worked, "Raqa is Being Slaughtered Silently" (RBSS).

"Film maker Naji Jerf, father of two children, was assassinated... today in Gaziantep", on the border with Syria, with a silencer-equipped pistol, the group said in a statement on Twitter.

RBSS is a group of citizen journalists who work to expose human rights abuses in Raqa, the northeastern city that IS uses as its de facto capital in Syria.

A friend of Jerf's said he had been "supposed to arrive in Paris this week after receiving, along with his family, a visa for asylum in France".

Jerf was also editor in chief of Hentah, a Syrian magazine that reports on the "daily lives of Syrian citizens", said the publication's website.

This is not the first time a Syrian occupation figure has been murdered in Turkey.

At the end of October, ISIS claimed responsibility for killing militant Ibrahim Abdelkader and a friend. They were found decapitated in a house in Sanliurfa in southern Turkey.