Tory backbencher Mark Pritchard has been arrested and bailed over an allegation of rape.
The Wrekin MP voluntarily attended Holborn Police Station on Tuesday evening over an incident alleged to have taken place in central London. He was arrested and then released on police bail four hours later.
A Scotland Yard spokesman said: "We can confirm that a 48-year-old man voluntarily attended a north London police station on Tuesday, December 2 where he was arrested, following an allegation of rape in central London.
"He has been bailed to a date in early January 2015 pending further inquiries."
A letter from Met officer Sandra Looby to Speaker John Bercow said: "I write to inform you that on December 2 Mark Pritchard MP was arrested at 6.14pm at Holborn Police Station in London by Metropolitan Police Service officers.
"Mr Pritchard was questioned by police and released on police bail later the same evening at 10.16pm."
A Conservative Party spokesman said: "This is a police matter. It would be inappropriate to comment while an investigation is taking place."