Police are trying to trace a woman in connection with a theft at an NHS test and trace centre during an anti-vaccination protest.
Dozens of protesters entered the site in Milton Keynes on Wednesday.
Thames Valley Police said during the incident "an individual was seen to take equipment".
A CCTV image has been issued of a woman officers believe may have information about what happened and who they would like to speak to.
Police are still investigating Wednesday's incident and no arrests have yet been made.
Ch Insp Graham Hadley said: "We are carrying out a thorough investigation into the protest.
"As part of our inquiries, we believe the woman pictured may have information that could help our investigation."
He also appealed for anyone who witnessed the protest or had footage of the incident to contact police.
Videos of the anti-vaccination protest showed the marchers throwing traffic cones towards a marquee set up to administer tests at the NHS centre, and knocking down signs.
Abuse was also shouted at staff by some of the protesters.
On Thursday, Home Secretary Priti Patel said on Twitter: "It is completely unacceptable that conspiracy theorists are intimidating and harassing those administering tests or delivering the life-saving vaccine programme."
Health Secretary Sajid Javid also condemned the protest, saying: "This kind of vile behaviour is unacceptable."
The protests happened on the day Prime Minister Boris Johnson visited a vaccination centre in Milton Keynes, and encouraged people to get a booster jab.
Marchers also entered the lobby of Milton Keynes Theatre during a pantomime on Wednesday afternoon.
Writing on social media, a spokesman for the theatre said "a group of protestors forced their way into the venue's foyer before being escorted out of the building by the police".
"Although we respect the right to choose whether to have a vaccination, we rebuke the actions taken today that saw our staff and patrons frightened and assaulted," he said.
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2021-12-31 08:28:33Z
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