A human rights group on Monday called on the Libyan officials to investigate and dismiss forces involved in after a video appeared on social media purportedly showing a military unit executing 20 suspected militants.
The video was seen by Reuters on social media but it could not be independently verified.
It appears to show a military unit linked to eastern commander Khalifa Haftar executing 20 men accused of being Islamic State militants found guilty of bombings and killings.
The video is the latest that appears to show Haftar’s Libyan National Army LNA troops engaged in summary executions of suspected militants.
The LNA spokesman in Benghazi declined to comment on the video and has previously denied its forces are involved.
An LNA special forces commander, Mahmoud al-Werfalli, appears in the video.
The United Nations has previously called for the LNA to dismiss him after a video in March allegedly showed al-Werfalli shooting dead three men who were kneeling and facing a wall with their hands tied behind their backs.