Assisting with detection, CCTV can also act as a deterrent i.e. building or an area with CCTV installed becomes a less attractive target if an intruder is aware that his or her actions may be observed or recorded.
CCTV also contributes greatly to the fight against terrorism. Its value as a surveillance tool is immeasurable. Being able to monitor suspicious behavior gives the police and the security services a greater ability to stop terrorist activity in its tracks and protect the public from harm.