Terrorism / suspicious activity
Immediate threats, suspicious activity and national-security concerns.
Immediate terrorist threat?
If you believe there is an immediate terrorist threat, a suspicious device presenting immediate danger, or danger to life or property, call 999. The UK Anti-Terrorist Hotline is 0800 789 321.
Report activity that is not an immediate emergency to Counter Terrorism Policing or MI5 using the routes below. Never approach a suspicious device or person — report it and let the authorities assess it.
Terrorism, national security and suspicious activity
| Concern | Where to report | Contact |
|---|---|---|
| Immediate terrorist threat | Police | 999 or Anti-Terrorist Hotline 0800 789 321 |
| Possible terrorist activity (not an immediate emergency) | Counter Terrorism Policing | 0800 789 321 or official online reporting route |
| National-security concern such as terrorism or espionage | MI5 / Security Service | Secure online reporting; Freephone 0800 111 4645; 020 7930 9000 |
| Suspicious activity on the railway | British Transport Police | 0800 40 50 40 or text 61016; 999 if emergency |
| General crime / information for police | Local police | 101 / online; 999 emergency |
Official sources
All reporting topicsLast verified 28 September 2026