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Acero: My father is a security guard at the Federal Building and I told him I was coming here, and he was like, “Oh, that’s closed.”

Various similar businesses have sprung up around the UK in recent years, including My Local Bobby, which was founded in 2016 and now has almost 150 security guards, as well as a fleet of cars.

A security guard insisted their visit was not related to immigration, saying: "This is not ICE. We would never let ICE in here."

“We see you, private security guards! You don’t have to do this!”

Leaving the building shortly afterwards, he was flanked by security guards as he walked past photographers and camera crews to a waiting car.