On his 66th birthday, police arrested Andrew Mountbatten-Windsor on suspicion of misconduct in public office, according to police.

The former prince — who is the first senior British royal to be arrested in almost 400 years — has been under increased scrutiny since the US government released documents detailing his ties to the late sex offender Jeffrey Epstein. Police did not specifically outline what led to today’s arrest.

The former prince has denied all accusations against him and insisted he never witnessed or suspected any of the behavior of which the late Epstein is accused. He has not commented publicly on these more recent allegations of misconduct in public office.