Detectives are investigating a handwritten cardboard sign left on a roadside which claims to name the killer of a schoolgirl murdered 17 years ago.

The piece of cardboard was left among flowers in Greenhithe above a plaque near where 16-year-old Claire Tiltman was stabbed to death in 1993.

Officers from Kent Police's cold case investigation team have retrieved the cardboard, which names the alleged murderer, the type of car he drove and the company he worked for.