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Six Australian police officers are being investigated after being filmed viciously beating a disabled man.

The Victoria officers were caught on CCTV verbally abusing the man, whose psychologist contacted police to flag concerns over his mental health.

The man can be seen being pinned down on his own front lawn while one officer calls him a "f****** idiot", punching him in the back.

Another then thrusts a can of pepper spray in his face, saying: "You like that? Smells good, doesn't it?"

As yet another cop sprays the man with a hose pipe, their lead officer appears to start filming the incident on his mobile phone.

The man on the ground can be heard yelling, "My back...my eyes" before being arrested.

Identifying himself to Australian new network ABC as John, the pensioner said he thought he would die when officers hosed his face after spraying him with capsicum spray in September last year.

“He’s aiming for my nostrils and it’s going into my lungs — and that’s when I started choking from the water and from the hot mace going into my respiratory [system]...I couldn’t breathe.”

The Independent Broad-based Anti-corruption Commission (IBAC) confirmed they were investigating the "serious allegations of excessive use of force by Victoria Police".

An IBAC spokesman said: "Victoria Police, as their employer, is responsible for determining whether the officers are 'stood down' from policing duties while they are subject to investigation.

"Our practice is we conduct an initial inquiry...it is too early at this stage to form an opinion of whether they should be stood down."

The officers are reportedly still working despite the investigation.

A spokesman for Victoria Police said: "We have no tolerance for poor behaviour within our ranks. We will examine carefully any new evidence contained in the media's reports."

The ABC reported the man plans to launch civil lawsuit against Victoria Police.