Reuters
Four men have been arrested after images of Donald Trump and convicted sex offender Jeffrey Epstein were projected on to Windsor Castle on Tuesday, as the US president arrived in the UK for a state visit.
They were arrested on suspicion of "malicious communications following a public stunt in Windsor" and remained in custody, Thames Valley Police said.
Those arrested were a 60-year-old from East Sussex, a 36-year-old and a 50-year-old from London, and a 37-year-old from Kent.
The force said officers responded "swiftly" to stop the projection, and an investigation was under way.
Trump is set to meet King Charles in Windsor Castle during the first full day of his state visit on Wednesday.
He arrived in London late on Tuesday and stayed at the US ambassador's residence in the city overnight.
Some protesters gathered in Windsor ahead of the visit and a significant police operation is in place in the town.
Trump was friends with Epstein in the 1990s and early 2000s. The president has never been officially accused of wrongdoing in connection with the deceased paedophile financier.
Trump's visit comes a week after the prime minister sacked the UK's ambassador to the US, Lord Peter Mandelson, over his relationship with Epstein.