A former Tory minister has been arrested on suspicion of rape.
Sky News understands the MP was accused by a young woman who works in parliament.
He was arrested on Saturday morning, with the story first appearing in The Sunday Times.
A police statement said: “On Friday 31 July, the Metropolitan Police Service received allegations relating to four separate incidents involving allegations of sexual offences and assault.
“These offences are alleged to have occurred at addresses in Westminster, Lambeth and Hackney between July 2019 and January 2020.
“The Met has launched an investigation into the allegations.
“A man in his 50s was arrested on Saturday 1 August on suspicion of rape and is currently in custody in an east London police station.”
Sky News understands the woman’s complaint was reported to a fellow MP, who raised it with the chief whip Mark Spencer and with Jacob Rees-Mogg, the leader of the House of Commons.
She then went to police.
A Conservative Party statement said: “We take all allegations of this nature extremely seriously. As this matter is now in the hands of the police it would be inappropriate to comment further.”