Public vigilance is always important regardless of the current national threat level, but it is especially important given the current national threat. Sharing national threat levels with the general public keeps everyone informed and explains the context for the various security measures (for example airport security or bag searches) we may encounter as we go about our daily lives.
If you have information about possible terrorist activity, call the Anti-Terrorist Hotline: 0800 789 321.
The Anti-Terrorist Hotline is for tip-offs and confidential information. For warnings about possible bombs or other immediate threats please call 999.