ISIS wants to be rid of foreign fighters . They arrested 30 fighters belonging to an ISIS backed group . The opposition Free Syrian Army is turning against foreign fighters in Syria 's civil war , arresting some 200 outsiders with ties to al-Qaeda groups . Rights groups say al-Qaeda responsible for executing about 200 .
ISIS wants to be rid of foreign fighters . They arrested 30 fighters belonging to an ISIS backed group . Rights groups say al-Qaeda responsible for executing about 200 .