The United Nations Libya mission has condemned "brutal and outrageous summary executions" in the eastern city of Benghazi, after pictures emerged appearing to show at least 10 people being shot dead at the site of a twin car bombing.

Key points: Video shows man in military uniform executing 10 men in street

Video shows man in military uniform executing 10 men in street Man believed to be member of Libyan National Army, wanted for similar killings

Man believed to be member of Libyan National Army, wanted for similar killings Twin car bombing killed 35, injured 60 in Benghazi

Video and photos being circulated on social media appear to show the executions in front of Benghazi's Bayaat al-Radwan mosque, where a twin car bombing on Tuesday left at least 35 people dead.

The footage shows a gunman dressed in military camouflage, in front of a row of blindfolded men kneeling in blue jumpsuits in front of damaged mosque gates.

The man walks along the line executing each of the men before firing another barrage of bullets into their bodies.

A crowd chants: "The martyrs blood will not go in vain," as men in military uniforms load the bodies onto the back of two trucks and drive away.

Via Twitter, the UN Libya mission, UNSMIL, demanded the gunman who they identified as Mahmoud al-Werfalli be immediately handed over to the International Criminal Court (ICC).

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In a follow-up tweet, the UNSMIL said: "Those responsible for committing or ordering summary executions are criminally liable under international law."

Mahmoud al-Werfalli is a special forces commander wanted by the ICC for allegedly carrying out a number of similar killings.

He is from an elite unit attached to Khalifa Haftar's Libyan National Army (LNA), which controls Benghazi, and battled Islamists and other opponents in the city until late last year.

After the ICC said it was seeking al-Werfalli's arrest in August, the LNA announced it was investigating him and had detained him, though his whereabouts were unclear.

The special forces dismissed the ICC warrant.

Tuesday's twin car bombing killed 35 and injured around 60 people. ( Reuters )

A spokesman for the LNA could not immediately be reached for comment on the images, which were posted as UN Libya envoy Ghassan Salame visited Benghazi yesterday.

Mr Salame met with Mr Haftar at a military compound near the city to express condemnation of the car bombing.

Mr Haftar, a divisive figure in Libya, has increasingly been courted by the international community as he has gained power on the ground.

He is considered a likely candidate in elections likely to be held by the end of the year.

Reuters