The armed revolt by the Shueitat tribe in the eastern province of Deir el-Zour was the first sign of local resistance to the Islamic State group since its fighters swept into the province.
The Britain-based Syrian Observatory for Human Rights and Turkey-based activist Thaer ak-Deiri said Monday that Islamic State group fighters regained control of three villages of the Shueitat tribe.
Fighting between the two sides erupted July 30 and for a time the tribesmen managed to evict the Islamic State group fighters from their villages.
