The offices of Deputy Speaker Nigel Evans have been searched by police in connection with an investigation into allegations of rape and sexual assault.
Commons Speaker John Bercow said the offices were searched after an order was granted by Preston Crown Court on Thursday. He said he had been consulted before officers entered Parliament.
In a statement to MPs at the start of yesterday's sitting, Speaker Bercow said: "The rooms of a Member were searched yesterday pursuant to a warrant issued by the circuit judge in Preston Crown Court on 16 May. The warrant related to the investigation of a serious arrestable offence."
Mr Evans, who denies the allegations, has stepped aside from his duties in the Commons though he has not been suspended.
The Tory MP for Ribble Valley was arrested on May 4 on suspicion of raping one man and sexually assaulting another between July 2009 and March 2013.
Mr Bercow continued: "I should remind Members... that the precincts of Parliament are not a haven from the law."