A video appears to show a police officer kicking a man as he is restrained on the ground by several officers.
A police watchdog is investigating after the footage was widely shared on social media.
At least five cops are seen standing around a suspect pinned down on his knees at a car park in Edgware, London, in a video taken in the early hours of Friday morning.
A female officer walks over to the detained man and appears to boot him hard in his lower body.
The clip shows the officer shouting and waving her arms out at the man holding the camera as he questioned her use of force.
She appears to tell the person taking the footage to “get lost”.
A colleague grabs her hand from behind and escorts her away as witnesses ask her why she acted violently.
The Met told The Mirror the video was taken during an arrest made at 4am on Friday morning.
The 25-year-old man being detained was charged with an array of offences, namely criminal damage, exposure, two counts of racially aggravated public order offences, and four counts of assaulting an emergency worker.
When confronted with the clip, the Met spokesman said their professional standards body have reviewed the footage.
The Independent Office for Police Conduct (IOPC) will now investigate whether the policewoman’s actions were a justifiable use of force.
Officers should use “proportionate and justifiable” force during arrests, the Met said.
The man appeared in Willesden Magistrate’s Court the following day, where he pleaded not guilty to all charges.
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He will appear at the same court on January 17 next year, police say.
The Met’s statement reads: “We are aware of a video shared on social media that appears to show an officer kicking a man in the feet or lower legs as he is being restrained.
“Officers know that their actions are always subject to scrutiny and that any use of force must be proportionate and justifiable.
“After this footage was brought to our attention, it was reviewed by Met’s Directorate of Professional Standards alongside other available information.
“Following the review, a referral has been made to the Independent Office for Police Conduct.
“We have established that the video relates to an incident that occurred at around 04:00hrs on Friday, 3 September in a car park off Capitol Way, N9.
“A 29-year-old man was arrested and later charged with criminal damage, exposure, two counts of a racially aggravated public order offence and four counts of assaulting an emergency worker.
“He appeared at Willesden Magistrates’ Court on Saturday, 4 September where he pleaded not guilty to all offences. He was bailed and will appear again at the same court on 17 January 2022.”