Four arrests after images of Trump and Epstein projected on Windsor Castle (videio inside)

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 an investigation was under way after officers responded "swiftly" to stop the projection on the castle, where Trump will meet King Charles during the first full day of his state visit on Wednesday.