Commander of Libya's eastern-based army, General Khalifa Haftar, called for an investigation into the alleged illegal execution of two prisoners by soldiers.
"General Haftar called for a thorough investigation into the video footage that surfaced online and shows illegal practices in dealing with terrorist prisoners and referring the results of the investigation to competent legal authorities," army spokesman Ahmad Mismari said in a statement late Wednesday.
Mismari also said that Haftar demanded the revealing of all details and procedures taken on every prisoner, and ordered the army to commit to the instructions regarding the treatment of detained prisoners.
A video surfaced on social media showing a group of Libyan army soldiers in the eastern city of Darna beating and killing two people in civilian clothes suspected of being detained prisoners.
The army is launching a military operation to take over Darna from the militants who control the coastal city.
The army has besieged Darna since 2015, demanding the armed group of the Shura Council (Consultative Council) of the Mujahideen, a coalition of Islamist militias, leave.
The army accused the group of being loyal to al-Qaida.
Mismari announced on Sunday that the army has taken over more than 90 percent of Darna, expecting full control of the city in the next few days.