A reward of £20,000 has been offered to anyone with information over the unsolved murder of teenager Karl Hamilton - 12 years on from his death.

Karl, 17, was stabbed to death when his friends became involved in a row with around 15 youths in Hackney, east London on 10 January 2004.

The catering assistant suffered multiple stab wounds to his head, torso and thigh when he was attacked as he tried to run away.

Three men were charged with his murder but subsequently acquitted in court.

Kim Williams, Karl's mother, said her family still feel the loss of Karl "tremendously" as she urged anyone with information to come forward.

We know some of you may have been young at the time but you may now have families of your own. Maybe that will help you to understand how we, Karl's family, felt at the time and how we have suffered since his murder in 2004. Kim Williams

Detective Chief Inspector Chris Jones said Karl's family deserved justice after "living in limbo" for more than a decade.

"For more than a decade Karl's family have lived in limbo, not knowing who was responsible for taking their son, brother and grandson from them."

"We are hoping allegiances may have changed and individuals who may have previously been in fear may now feel able to speak to police and pass on any information, no matter how small or insignificant it may seem."