According to Sky News the MP Eric Joyce has been arrested after an alleged fight in a bar in the House of Commons, Sky sources say.
The independent Member of Parliament for Falkirk was held after the incident at the Sports and Social Club bar.
A Metropolitan Police spokesman said: “Police were called shortly before 10.30pm this evening to reports of a disturbance at a bar within the House of Commons.
“Officers attended and a man aged in his 50s was arrested in connection with this incident.
“He remains in custody and inquiries continue.”