The current threat level is assessed as SUBSTANTIAL (as of 20th July 2009).
The Joint Terrorism Analysis Centre (JTAC), which operates independently of Ministers, has changed the UK threat level from international terrorism from SEVERE to SUBSTANTIAL.
The means that a terrorist threat is a strong possibility and an attack might occur without further warning.
JTAC assesses the threat from international terrorism by considering all relevant intelligence and information. Its decision is based on a broad range of factors, including the currently assessed intent and capabilities of international terrorist groups.
The threat level can change - up or down - at any time in the future.