The Joint Terrorism Analysis Centre (JTAC) is an all-source intelligence organisation closely related to the United Kingdom Security Service which provides advice to the British government and firms within the Critical National Infrastructure on terrorist threats.
Operating from Thames House on Millbank in central London, it provides regular assessments to government departments, major companies and institutions, predominantly in the transport, financial services, utilities and telecommunications industries.
Assessments are used to inform the threat levels disseminated through the Security Service, Home Office and Ministry of Defence.
Media reporting highlighted a reduction in the threat level from "Severe General" to "Substantial" based on the assessment that the risk of an attack was at its lowest point since 9/11.
These news reports were the first release of threat gradings outside the Critical National Infrastructure.