The sign which 'named' the killer was found at a memorial site.
A handwritten sign claiming to name the killer of a Kent schoolgirl who was murdered 17 years ago is being investigated by police.
Claire Tiltman, 16, was murdered in an alleyway in Greenhithe on 18 January 1993, while on her way to see a friend.
The cardboard sign was found next to a plaque in memory of the teenager.
Her father Cliff Tiltman said: "It's good news that they've got something else after all this time, but I never get too excited."
"We've had loads over the years with people saying things and doing things which have come to nothing," he said.
The father of Claire Tiltman says he hopes the new clue leads to her killer
The cardboard sign was found on 3 February by a local reporter.
The sign has been sent to Kent Police's cold case investigation team for forensic tests.
Mr Tiltman said: "The impression I get from them, is that it's such a high profile case they can't just give up."
The Dartford Grammar School for Girls pupil was stabbed more than 40 times, in an apparently motiveless attack, four days after her 16th birthday.
Claire's mother Lin Tiltman died of throat cancer in March 2008, but told Mr Tiltman: "Don't ever give up on Claire."
No-one has ever been charged with her murder.