A reward of £10,000 has been offered in a probe into the unsolved murder of a schoolgirl found dumped in a river in 1996.

Caroline Glachan, 14, was found dead on the water's edge of the River Leven in Bonhill, West Dunbartonshire, 20 years ago on August 25. She had suffered blunt trauma to the head and drowned.

Her killer has never been found but officers from Police Scotland remain committed to finding the culprit and charity Crimestoppers has now put up the award for information leading to an arrest and conviction.

Angela Parker, national manager for Crimestoppers in Scotland, said: "Twenty years on and Caroline's family are still left with unanswered questions as to what happened to her.

"I am asking for people who might have any information, no matter how insignificant they think it might be, to contact Crimestoppers anonymously, because you could be the person that provides the missing pieces to the puzzle.

"We never ask who you are or any of your details. You'll never speak to anyone from the police or ever go to court. Please do the right thing and tell us who is responsible for taking a young girl's life."

Police recently made a fresh appeal for help and information along with the young girl's mother.

Detective superintendent Jim Kerr made the appeal on the BBC Crimewatch programme earlier this month, which prompted a positive response from the public.

The programme focused on Caroline's murder and featured her mother Margaret McKeitch and her best friend Joanne Menzies.

Mrs McKeitch said: "I looked out the window and there was a police officer with a police woman and I knew. I just knew. I got this unbelievable pain, which I can still feel, just a pain in my heart. I just knew it was her.

"They came up and they asked about her and the clothing that she had on. I told them and they said that they believed that it was her but they would have to identify her.

"Of course by this time it is my birthday so life didn't begin at 40. For me, it basically ended."

More than 20 calls were received following the programme.