Safety - Threat Levels
Terrorism presents a serious and sustained threat. Terrorist groups seek to cause widespread disruption, fear and intimidation. They use violence or the threat of violence as a means of publicising their causes, motivating those who might be sympathetic to them and intimidating those who do not sympathise. They often aim to influence government policies and they often reject existing democratic processes, or even democracy itself, as a means of achieving their objectives.
In the UK, information about the national threat level has been available on the MI5 and Home Office websites since 2006. In September 2010 the threat levels for Northern Ireland-related terrorism were also made available. Visit MI5's official site here MI5 Threat Levels
In the US, the US Department of Homeland Security (DHS) replaced the color-coded alerts of the Homeland Security Advisory System (HSAS) with the National Terrorism Advisory System (NTAS), designed to more effectively communicate information about terrorist threats by providing timely, detailed information to the American public.
It recognizes that Americans all share responsibility for the nation's security, and should always be aware of the heightened risk of terrorist attack in the United States and what they should do. Visit The National Terrorism Advisory System at NTAS Threat Levels.