Video footage of a man being shot twice with a Taser gun has been passed to the police complaints body.
The man was filmed struggling during the incident on Sunday night in Upper Parliament Street, Nottingham, as four officers attempted to arrest him.
A large group appeared and some people remonstrated with officers.
Nottinghamshire Police said no complaint had been made but they have referred the footage to the Independent Police Complaints Commission (IPCC).
The footage shows two officers trying to arrest the man who is lying in the road outside Nottingham's Theatre Royal.
But when they encounter difficulty, the officer with the Taser orders his colleague to let go of the man.
He then fires the Taser, which consists of two darts on the end of wires containing a 50,000 volt shock.
The two male officers were joined by two other officers who ordered the man to put his hands out.
When he failed to do so, the officer with the Taser fires it again, shouting: "Taser, Taser, Taser."
A crowd of 30 to 40 people quickly gathered and questioned the police's tactics.
The video was given to local radio station Trent FM and has also been posted on YouTube.
'Trust and confidence'
Nottinghamshire Police said officers were trying to arrest the 40-year-old man after they were called out by door staff at one of the city's nightspots.
A police officer was assaulted, the force claimed, and needed hospital treatment.
A spokeswoman for the force said no complaint had been made against the officers involved and no-one had been suspended.
The man was subsequently arrested on suspicion of causing grievous bodily harm and released on police bail.
Assistant Chief Constable Peter Davies said: "We understand that some members of the public may be concerned about this.
"The public's trust and confidence is very important for us, which is why we have referred this matter for an objective investigation to the IPCC."
Tags: police, double, taser, arrest, probed
Location: Nottingham, Nottingham, United Kingdom (UK/GB) (load item map)
Marked as: approved
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