All 57 officers of a police tactical unit have resigned from the team after two of their colleagues were suspended for shoving a 75-year-old man to the ground, leaving him requiring urgent medical care.

As reported by Sky News, the two members of the Buffalo Police Department's Emergency Response Team who shoved the elderly man have since been suspended.

In addition, the other 57 members of the response team have since resigned from the tactical unit in protest at their colleagues being suspended. The officers will continue to work in larger police department.

The video was originally released by local radio station WBFO and was quickly circulated across social media.

It shows Martin Gugino holding a cell phone approaching a line of officers wearing riot gear as they attempted to clear the square ahead of the 8:00PM curfew. One officer then shoves the man with a baton before a second man pushes him back.

The 75-year-old then falls backward, unable to protect himself. The sound of his head hitting the ground can clearly be heard, and blood can be seen trickling from his head.

The video can be seen below (Warning: some readers will find it upsetting):

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One officer can be seen leaning over the man as if to attend to him, but is motioned away by a colleague. The line of officers then marches past the injured man.

Buffalo Mayor Byron Brown has confirmed that the man was transported to hospital, where he is currently in a stable but serious condition.

Despite the callous nature of the video, Buffalo Police Benevolent Association President John Evans said the men "were simply following orders from Deputy Police Commissioner Joseph Gramaglia to clear the square."

Per BBC, Evans told The Buffalo News:

"Our position is these officers were simply following orders from Deputy Police Commissioner Joseph Gramaglia to clear the square.

"It doesn't specify clear the square of men, 50 and under or 15 to 40. They were simply doing their job. I don't know how much contact was made. He did slip in my estimation. He fell backwards."

Speaking to local TV station WGRZ, Evans added the rest of the team had quit the unit "in disgust because of the treatment of two of their members, who were simply executing orders".

Mayor Byron Brown said that he was "deeply disturbed by the video" and added that Police Commissioner Byron Lockwood had ordered an investigation into the incident.

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Unrest continues to unfold across the US, as protests - some peaceful, some violent - are calling out the systemic injustices carried out against black people, not least seen by the recent deaths of George Floyd, Ahmaud Arbery, and Breonna Taylor.

As well as a call for justice, these ongoing protests are also demanding an end to police brutality and the racism that is so deeply entrenched in America and the western world.

The message is simple: Black lives matter.

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57 officers resign from riot unit after two of their colleagues are suspended for shoving elderly man