The sources said that the SDF has freed 26 ISIL members that had been previously captured in the town of Ein Issa in Northern Raqqa.
The sources further said that SDF has, instead, started arresting civilians in a camp near Ein Issa.
The arrests were launched after an SDF members was attacked by unknown raiders at the entrance of Ein Issa.
The pro-opposition Syrian Observatory for Human Rights (SOHR) reported on Monday that the SDF transferred over 40 ISIL terrorists in Deir Ezzur to Hasaka province in Northeastern Syria.
The SOHR said that over 40 ISIL terrorists - that had surrendered to the SDF in Southeastern Deir Ezzur - have been transferred to Hasaka via Northern Deir Ezzur.
A Turkish daily reported on Sunday that the US forces deployed in Syria transfer a large number of ISIL commanders and senior members to the safe areas and military bases controlled by the SDF in the country.
The Turkish-language Sabah newspaper reported that the ISIL commanders and terrorists are transferred to the SDF bases to undergo advanced trainings to carry out terrorist acts.
It quoted the local sources as saying that the US helicopters, carrying the ISIL commanders, land in the SDF bases in Deir Ezzur and Hasaka mostly mid night.