ST. LOUIS — Cellphone video that shows a witness raising his hands in the air immediately after the fatal shooting of a black 18-year-old by a white police officer in Ferguson appears to support previous accounts and could bolster arguments that Michael Brown was surrendering when he was shot, legal experts said Friday.

The video obtained by The Associated Press and first aired by CNN shows two landscapers who were working near the street where Brown was shot by officer Darren Wilson on Aug. 9. In the video, a man can be heard saying, “He had his (expletive) hands in the air,” while one of the workers raises his own hands up.

The man who took the cellphone video, who spoke on condition of anonymity because he feared for his safety, said the voice is that of the worker raising his hands, but that isn’t clear on the video.

The workers are not from Ferguson and were employed by a business from Jefferson County, south of St. Louis. They have not come forward publicly and the AP has been unable to reach them.

The comment on the video largely matches those of residents of the apartment complex where the shooting occurred, who said Brown was surrendering when he was killed. The shooting spurred several days of sometimes violent protests in Ferguson. A state grand jury and the Justice Department are investigating, but no decision on whether Wilson will face charges is expected until next month.

Benjamin Crump, the attorney for Brown’s family, said both workers came forward and told the family their account of the shooting. He described the video as “of paramount significance.”

“Not because they were not residents of Ferguson, and not because the construction workers were Caucasian, but because it is a contemporaneous recording of their immediate actions of what they had just witnessed,” Crump said. “It’s the best evidence you can have other than a video of the actual shooting itself.”