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Anti-vaxxers descended on a town centre vaccine centre and told a member of staff it was "potentially a crime scene."
When challenged on whether they were police officers, one woman said she was "a common law police officer and member of the public" but when asked for ID they left.
The encounter at Pharmacy2U in Fremlin Walk, Maidstone, was filmed by the anti-vaxxers themselves.
A woman with a clipboard began by telling the pharmacy's site co-ordinator Jason Szamalowicz: "We have spoken to the police and they know we are here," but went on to talk about "conducting an investigation".
She told him: "There is enough evidence to prove that injury, harm and death has been caused by the vaccine. This (pointing to the clinic) is potentially a crime scene."
When Mr Szamakowicz asked: "Are you a police officer?" she responded by saying that she was "a common law police officer and member of the public."
When he responded: "I'm guessing you're anti-vaxxers then?" a voice off-camera says: "We're not anti-anything," while the woman with the clipboard responds: "That's not a term... That's very offensive."
The anti-vaxxers left when asked for their ID.
It is an offence under Section 90 of the Police Act 1996 to impersonate a police officer.
Kent Police said the incident had not been reported to them.
After the incident, Mr Szamakowicz said: "I didn't report it to the police. Frankly when I went back inside I burst out laughing.
"The 'proof' they handed me was so ridiculous, it even claimed they had a lawyer working for them who was a nephew of John F Kennedy!
"I've become something of a media star, with all my colleagues sending the video around."
But Mr Szamakowicz said some of the "protests" were more serious.
He said: "At one of our northern branches, anti-vaxxers stuck posters to the window with razor blades behind them and the staff cut their fingers when they tried to remove them."
Earlier this month another group of anti-vaccine protesters went to Maidstone Police station.
In a video they posted on social media, they were seen at the front desk stating that they had been at the station five weeks previously and had spoken to officers regarding a “pack of evidence for crimes against humanity and mass genocide.”
They went on to say: “It has been quite long enough for you to have gone through all of the evidence and we want a crime reference number today.”
Since the vaccine roll out in December 2020, there have been many anti-vaccine protests up and down the country.
Multiple demonstrations have happened in Kent, with one protest being at the Hazlitt Theatre in December, where protesters accosted families before the Christmas pantomime showing of Jack and the Beanstalk.
Campaigners have also been seen at Bluewater shopping centre and in Maidstone town centre, with placards stating the vaccine is not safe or effective.
Turkey Mill Business Park was also targeted in August, with the charity Involve Kent forced to close its offices for the day.