Animal rights activists scaled the roof of a national beef industry event in protest against the meat industry.
The demonstration, which began in the early hours of Saturday, is said to have resulted in one protester being taken to hospital after chaos broke out outside the Darlington Farmers Auction Mart (DFAM) in County Durham.
The photos showed masked activists from the Animal Justice Project (AJP) standing on the roof of the building holding banners and shooting colored smoke flares.
A spokesman for the group said the activists were “covered in excrement” after an event attendee allegedly used a sprinkler to dump manure on them.
The National Beef Association (NBA), which is organizing the exhibition which takes place this weekend, describes it as a celebration of the best of British beef, attracting at least 5,000 guests a year.
The AJP said their protest was “peaceful” and “quiet” and aimed to highlight the “suffering of farm animals and concerns about environmental safety”.
Police have been on the scene since 5am working to break up the demonstration.
An AJP spokesman told PA: “A farmer sprayed us with cow poop using a machine.
“It has been a peaceful protest and a silent protest and we are overwhelmed and outnumbered by hundreds of angry farmers.”
An NBA spokesman said there was a “wonderful atmosphere” at the event and had no further comment on the protest.
Durham Police said: “Our officers are working to bring the protest to a safe end and minimize the impact on the wider community.”