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A man allegedly punched a police officer in the face during an arrest on a London underground train.

Footage recorded by a passenger in the District Line carriage shows a man sitting on an empty row of seats while an officer stands in front of him.

The cop is trying to place handcuffs on the man, whose identity is not known.

The Metropolitan Police said the man had been spoken to as he failed to wear a mask on a tube train.

In the clip, the officer can be seen trying to restrain the passenger, but the man punches him in the face and shouts: "Don't touch me!"

The officer then pulls out his baton and demands that the man give him his wrists so that he can handcuff him.

The incident happened on a District Line train on July 6
(Image: Jam Press/@CrimeLdn)

"You just punched me in the face," he tells the man, who in turn accuses the officer of "strangling" him.

"Do as you're told!" the police officer shouts, as a second male passenger stands up and tries to reason with the man.

At this point, the train conductor makes an announcement that a passenger alarm has been sounded.

The officer again pleads with the man several times to give him his wrists, telling him to get on the floor and spread his arms out so that he can "cuff you safely".

The police officer was allegedly punched by a passenger
(Image: Jam Press/@CrimeLdn)

But the passenger refuses to do so and repeatedly tells him: "If you hit me, I'll do you for assault."

He then goes on to accuse the officer of putting his hands over his head.

The conductor then makes an announcement that the train will be moving into the next station where further assistance will be called in.

At this point, a female passenger can be heard telling another passenger: "He might be exempt, you don't know, so you shouldn't judge.

"He's getting beaten up for nothing because he might be exempt."

The police officer handcuffed the man
(Image: Jam Press/@CrimeLdn)

Finally, the police officer takes hold of the man's arm and pulls him out of his seat before placing his hands behind his back and cuffing him.

The officer then proceeds to read him his rights, but the angry man accuses him of "assault" and tells him he is "finished" as the officer places a hand on his back to push him against the wall of the train.

"That's assault, that's the second time," he says, adding: "you're fired, you're gone, you're finished."

The British Transport Police told The Mirror: “Officers were called to Acton Town underground station at 7.41pm on Tuesday 6 July following reports of an assault on board a train.

"A 26-year-old man was arrested on suspicion of assaulting an emergency worker and conveyed to police custody where he remains.

"One person was taken to hospital for treatment to minor injuries.

"Enquiries into this incident are ongoing.”

The Metropolitan Police said: "We are aware of a video circulating on social media which shows the arrest of a man at Acton Town Underground Station on Tuesday, 6 July.

"The man had been spoken to by an officer at approximately 19:35hrs in relation to failing to wear a mask on a tube train. The man became aggressive and the officer was subsequently assaulted.

"The officer was taken to hospital for treatment to a minor facial injury and has since been discharged.

"A 26-year-old man was arrested on suspicion of assault on an emergency worker and taken to a west London police station.

"The footage online shows a portion of the entire interaction of the incident between the officer and the man.

"The footage was referred to the Met’s Directorate of Professional Standards who reviewed all material available in order to understand the full facts.

"The review has been completed and no misconduct has been identified.

"Our officers understand that their actions will be scrutinised as they go about their work, and that the public have the right to hold them to account where appropriate."