MI5 - Security Service

MI5 The Security Service

Report a threat

To report an imminent threat call 999 or ring the Anti-Terrorist Hotline on 0800 789 321

To report non-urgent suspicions:
Contact Us here

IF YOU SUSPECT IT, REPORT IT


Current UK threat level

SUBSTANTIAL

Read more about threat levels >>

The Security Service (MI5) is responsible for protecting the United Kingdom against threats to national security. This website provides information about the Security Service, the threats it counters, links to sources of security advice and details of careers with the Service.

February 2014 release of files by The National Archives

28 February 2014

The National Archives has released 110 more historical files from the Security Service....

Agency Heads at
Parliament

Director General Andrew
Parker gives evidence
to intelligence committee