The police watchdog is investigating a mobile phone video of a man being repeatedly tasered by officers.
The footage shows the man rolling around on the floor in agony after one officer urges his colleagues to stand back before tasering him. As he struggles again during the incident on Sunday night in Upper Parliament Street, Nottingham, he is tasered for a second time.
Nottinghamshire Police said no complaint has been made against the officers involved and no-one has been suspended, but the case has been passed voluntarily to the Independent Police Complaints Commission (IPCC) so it can investigate.
In the footage, one of the four officers trying to arrest the man is also seen to punch him in the head area before back-up arrives.
It shows a crowd of 30 to 40 people gathered amid the incident, and they start questioning the police's tactics.
A woman behind the camera is heard to say: "Look at his face, did you get that? He don't look like he is resisting."
The man, who is shooting the footage, added: "Yeah, I can't wait to put it (the footage) on YouTube."
According to guidelines from the Association of Chief Police Officers, Tasers must not be used indiscriminately.
A spokeswoman for the police watchdog said: "IPCC investigators are currently assessing the incident and a decision on the level of IPCC involvement will be made in due course."
The man was subsequently arrested on suspicion of causing grievous bodily harm and released on police bail.
