TRIPOLI, Jan. 27 (Xinhua) -- The United Nation Support Mission in Libya (UNSMIL) on Friday expressed concerns over retribution killings in eastern Libya.

"UNSMIL is appalled by new reports of retribution killings in Libya. On Jan. 25, three bodies were reportedly found in Derna and five in Benghazi," the Mission said later on Friday on its official Facebook page.

"The brutal pattern of violence must end. Those in effective control of fighters and those ordering, committing such crimes are liable under international law," the Mission added.

Local media reported that the Mujahideen Council of the eastern city of Derna, a pro-al-Qaeda organization, carried out torture and execution to three young people.

A number of bodies were found in Benghazi on the side of a main roads in the city. The circumstances of the killings remain unknown.