Report suspect activity to MI5
Send a message to MI5 if you have information that will help protect the country against threats of national security, such as terrorism.
How to use this service
Use the link above, which will take you to the MI5 website. You can provide a name and contact details if you wish. Your message will be sent over a secure internet connection. After sending your message, you will see an on-screen acknowledgement.
All messages will be carefully assessed, but the MI5 cannot promise to respond to all of them. If your information relates to an imminent threat to life or property, please contact the police on 999 or the police Anti-terrorist Hotline on 0800 789 321.