Police say they had shot beanbags at the man before they opened fire

Officers say he matched the description of suspect wanted for a stabbing

Police shot dead the man who was holding a knife in a residential street

A black man was gunned down in the street by police after he was surrounded by officers in a San Francisco street.

Police Chief Gregory Suhr confirmed the man, who was holding a knife, was killed after the shooting in Bayview at around 5pm on Wednesday.

His description is said to have matched that of a suspected wanted for stabbing someone in a nearby street.

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A black man was gunned down in the street by police after he was surrounded by officers in a San Francisco street

Now a graphic video, which has not yet been verified by police, has emerged on social media which shows a man as he is surrounded by around eight armed police officers.

Standing on the sidewalk with his back up against a wall, he suddenly appears to double over.

But the man, who appears to be dazed, stands up again and begins to shuffle away - while the cops have the guns raised and trained on him.

The camera then cuts away as a barrage of bullets are heard while people are heard screaming in the background.

Now a shocking video, which has not yet been verified by police, has emerged on social media which shows a man as he is surrounded by around eight armed police officers

The man, who appears to be dazed, begins to shuffle away - while the cops have the guns raised and trained on him

Police blocked off the intersection of Third Street and Gilman Avenue in San Francisco and Munli trains were halted as they responded to the incident.

San Francisco Police Department Chief Suhr said officers fired beanbags at the man and used attempted other non-lethal force before they opened fire.

'It looks like an execution,' a local resident who told the San Francisco Police Commission, reported The Daily Beast. 'This is why we need the cameras and the video.'

Department of Public Health workers, who are typically sent out to assist families after a violent death, were at the scene in Bayview.

The footage follows a series of high profile police shootings which have sparked Black Lives Matter across the country.

Just two days before the San Francisco incident, Chicago cop Jason Van Dyke was arrested and charged with first degree murder.

The San Francisco incident follows a series of high profile police shootings which have sparked Black Lives Matter across the country. Chicago police Officer Jason Van Dyke (right) was charged with first degree murder in the killing of 17-year-old Laquan McDonald on October 20, 2014 (left)

The charge came after footage of him shooting black 17-year-old Laquan McDonald 16 times on the night of October 20 last year was made public by order of a judge.

Hundreds of protesters took to the streets within hours of the video's release, chanting '16 shots' and forming human blockades across roads in the city's West Side. Other demonstrators gathered outside police stations as at least two people were arrested in connection to the protests.

Chicago police chief Garry McCarthy was sacked on Tuesday over his handling of the case while Mayor Rahm Emanuel now faces pressure to stand down over the incident.