Tripoli — Libyans tried to rescue Ambassador Chris Stevens, cheering "God is great" and rushing him to a hospital after they discovered him still clinging to life inside the U.S. Consulate, according to witnesses and a new video that emerged Monday from last week's attack in the city of Benghazi.

The video, which appeared on the internet, confirms reports that suggested the U.S. envoy died of asphyxiation after the building caught fire.

The footage also sheds new light on the circumstances of the ambassador's death, apparently showing for the first time that some of the people who forced their way into the U.S. compound later tried to rescue Stevens after they found him lying alone, with no security detail, in one of the rooms in the building.

The video shows a group of young men who had earlier stormed the compound telling other protesters by the light of torches and mobile phones that they had found someone who appeared to be a foreigner lying on the floor.

"There is someone inside ... He is a foreigner, he is a foreigner. Take him out," said one man, shouting for help.

"Bring him out, man! Bring him out," another said.

"The man is alive. Bring him out, man. Bring him out," said a third.

"Alive, Alive! God is Great," the crowd cried. Someone called for a car.

"Make space, is there someone who is a medic around? Anyone who can get a car quickly?" another man can be heard saying.

The video has been authenticated since Stevens' face is clearly visible and he is wearing the same white t-shirt seen in authenticated photos of him being carried away on another man's shoulders, presumably moments later.