Report suspicious activity to MI5

    Report any threats to national security – such as terrorism and espionage – to MI5 (also known as the Security Service).

    Call 999 or the police anti-terrorist hotline on 0800 789 321 to report an immediate threat to life or property.

    Confidentiality

    Your message will be sent over a secure internet connection. You can choose to remain anonymous or include your contact details so the Security Service can get in touch with you.

    All the information you send will be treated confidentially.

    Other ways to contact MI5
    You can report threats by phone or in writing.

    MI5
    Freephone: 0800 111 4645
    Telephone: 020 7930 9000
    From outside the UK: +44 (0)20 7930 9000
    Find out about call charges

    The Enquiries Desk
    PO Box 3255
    London
    SW1P 1AE