Home Secretary Theresa May is expected to announce a broad independent inquiry into how public institutions handled allegations of child abuse. Mrs May will give details of the probe as she makes a statement to MPs this afternoon.
More than 100 official files relating to historic allegations of organised child abuse have gone missing, the Home Office has disclosed.
Mark Sedwill, the permanent secretary at the Home Office, said the documents - which related to a 20-year period between 1979 and 1999 - were "presumed destroyed, missing or not found".
ITV News correspondent Emily Morgan reports from Westminster:
The MP who raised the claims that a paedophile ring operated in Westminster during the 1980s said new allegations have now come to light.
Lord Brittan has defended his handling of a dossier alleging paedophile activity in Westminster when he was home secretary in the 1980s.
A 1980s dossier claiming paedophile activity at Westminster may have mysteriously gone missing but the questions still remain.