防止战略引入和环境预防是政府制定强大的反恐计划 - 竞赛的一部分。英国面临着一系列恐怖威胁。所有对我们构成威胁的恐怖组织寻求激进并招募人们为自己的事业。The Prevent strategy seeks to: • Respond to the ideological challenge of terrorism and aspects of extremism, and the threat we face from those who promote these views • Provide practical help to prevent people from being drawn into terrorism and ensure they are given appropriate advice and support • Work with a wide range of sectors where there are risks of radicalisation which needs to be addressed, including education, criminal justice, faith, charities, the internet and health A system of threat level has been created which represents the在不久的将来发生攻击的可能性。五个级别是：