Police have released CCTV of a man they want to speak to after an NHS worker was violently attacked and left unconscious on a north London bus police believe was triggered by face masks.

The victim, who works for the NHS’s track and trace programme, boarded the Route 149 bus just before Seven Sisters station, before the suspect boarded at the following stop at around 9:45pm on Sunday 23rd August.

Footage from the bus shows the 63-year-old victim appearing to attempt to socially distance from the man who was not wearing a mask properly, before being followed by the suspect to the back doors.

The victim was lefr unconscious after the incident and was hospitalised

It was here that the suspect launched into a violent physical attack, punching the victim repeatedly to the floor and stamping on his head five times.

Investigating officer PC Chris Bowman, from the Metropolitan Police’s Roads and Transport Policing Command, said: “Although there is no sound on the CCTV and all the victim remembers is waking up in hospital, we believe that this was all triggered by face masks.

“We think that the attacker, who had his face covering beneath his chin, took offence when the victim, who was fully covered, consciously moved away from him.

“When the attacker then follows the victim to the back of the bus, he can be seen pointing and gesturing at the victim’s face mask before he starts repeatedly punching and kicking him. This was a totally unwarranted violent assault and we urgently need to speak to this man.

"If anyone knows who he is or has any other information – or witnessed this offence – please call.”

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The suspect is described as a black man aged approximately 23-25 years, tall and with an athletic/muscular build.

He was wearing blue tracksuit bottoms, a white vest and white trainers.

Anyone with information is asked to call detectives on 07880 429 486 or 101, quoting the reference CAD 7981/23Aug.

Alternatively, people can call Crimestoppers anonymously on 0800 555 111 or tweet @MetCC with any information.