An activist group that reports on Islamic State atrocities says two of its members have been found slain in a city in southern Turkey.

The Raqqa-based activist collective — called "Raqqa is Being Slaughtered Silently — did not say when Ibrahim Abdul-Qadir and Fares Hamadi were killed. It blamed IS for the killings, which took place in the city of Sanliurfa.

Another Syrian activist group, the Local Coordination Committees, said Friday the two were known activists from Raqqa.

Since IS captured Raqqa last year, Raqqa is Being Slaughtered Silently has been releasing reports and photographs from inside the extremist group's de facto capital.

IS has carried attacks in Turkey, including two suicide bombings earlier this month that killed 102 people at a peace rally in the capital, Ankara.