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Curious photos of demonstrators assembled on a street outside a branch of Greggs today convinced many online that the world's first "anti-vegan sausage rolls protest" had been organised.

Dozens of protesters wearing yellow jackets lined a busy road in Manchester city centre this afternoon as part of nationwide demos against Theresa May's European Union withdrawal deal.

But some pictures quickly emerged of the group coincidentally stood outside a Greggs, the bakery firm which this week announced its move to introduce vegan sausage rolls.

And Twitter rapidly become full of jokey speculation the group were venting their anger at this.

(Image: Joel Goodman/LNP)

One user wrote: "Those people that post facebook memes about how plucky brits saw off the bosch during the war and how today's youngsters are all coddled and soft are currently stamping their feet outside a greggs in Manchester because there's no meat in some of the sausage rolls."

Another added: "A few years ago I would have found this impossible to believe. Not now.

"Deeply sad men angry about sausage rolls and the inherent threat to their supposed masculinity?"

Some suggested they'd actually prefer an anti-vegan sausage roll protest in the city.

(Image: Matthew Chattle/REX/Shutterstock)

But it seems the actual pro-Brexit rally was organised by a YouTube account called "Tommy Robinson News", which uploaded several videos from the demonstration today.

They were also spotted holding pro-Trump placards and wearing English Defence League clothing.

Greater Manchester Police said no arrests were made.

But in a demo in London, a 13-year-old girl was arrested on suspicion of assaulting a police officer.

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More than 100 people lined the streets and some set off smoke bombs in the Westminster protest.

Greggs has started serving its new sausage roll in 950 of its 1,900 stores.

It's a £1 Quorn-stuffed puff pastry, said to have been created as a result of "increasing demand for vegetarian and vegan products".