Caught on Camera: Thieves & Thugs: Criminals Caught on Camera

Nick Wallis shows how CCTV and technological advances are helping tackle the problem of violent crime, from burglaries to muggings and street fights. In west London, camera operators assist police as they try to enforce a drinking ban on a newly renovated park in Hammersmith, and later give guidance to officers after they spot a youth armed with a knife prowling the streets in the early hours