A £10,000 reward was offered today to help solve the 34-year-old murder of a Brighton schoolboy.

Keith Lyon, 12, son of the late bandleader Ken Lyon, was stabbed to death on downland at Woodingdean in 1967.

Despite a massive police investigation, including the fingerprinting of thousands of young teenagers, the killers remain at large.

The case has never been closed and today Sussex Police announced a cash reward for information leading to the arrest and conviction of the culprits.

Detective Superintendent Dave Gaylor said: "We have had several useful calls from members of the public recently but we need people who have been holding back to come forward.

"This was a shocking murder of an innocent child and we are determined to bring those responsible to justice."

Keith was walking from his home in Ovingdean to shops in Woodingdean when he was attacked and stabbed repeatedly.

Youths seen running from the scene have never been traced.

The detective running the day-to-day inquiries was fingerprinted in connection with the case as a boy.

Detective Inspector Bill Warner was one of thousands of children checked at the time Keith Lyon was killed.

Mr Warner said: "I was 13 at the time and I remember it well. Police visited all schools in the Brighton area at the time to fingerprint children.

"I had to go to the science class with my mates to meet plain-clothes police officers."

Mr Warner said he never thought that more than three decades later he would be in charge of the investigation.

He said: "Any murder is tragic but when the victim is a child it is even more catastrophic.

"I remember well how Keith's death at the time was the talking point everywhere you went in Brighton."

Anyone with information should contact Brighton CID on 0845 6070999.