The moment an angry customer punched a vegan activist protesting inside a pizza restaurant has been caught on video.
The video, posted to Facebook by DxE Brighton, shows activists entering the Pizza Express restaurant with a megaphone, chanting "it's not food, it's violence".
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One male customer confronted the protesters and began shouting at them.
"You're scaring these people, f**k off now," he shouted at one protester, before shoving her and forcing her to turn around to confront him.
When she turned to face him he punched her.
Other diners held the man back and the protest continued before the vegan activists eventually left and travelled to another protest site at the Brighton Town Hall.
Sussex Police told the Daily Mail the incident is under investigation.
"Incidents involving animal rights activists at several restaurants in Brighton on Sunday evening, in which protesters with loud hailers chanted slogans at diners, have been reported to police.
"It was alleged that at one establishment a protester was punched by a customer, and at another activists were thrown to the ground."
Nobody has been arrested but police say appropriate action will be taken if anyone is found to have broken the law.
DxE Brighton is a part of the same protest movement as activists that recently demonstrated in two North Island supermarkets.
The group, also calling themselves DxE, infuriated shoppers at Auckland's Countdown St Lukes in mid-September after they stood in the meat aisle holding signs demanding shoppers stop eating animals.
They reappeared a week later at Countdown Chartwell in Hamilton, this time singing as they walked through the aisles.