AN appeal to catch the murderers of an Edmonton schoolboy will feature on the BBC's Crimewatch programme tonight.

Detectives are now offering a £20,000 reward for information leading to the arrest and prosecution of those responsible for killing 15-year-old Negus McClean, who was stabbed in the chest and thigh in Westminster Road on April 10.

The aspiring rapper and Edmonton County School pupil was knifed after being chased by a gang of seven young men, after stepping in to stop his younger brother's Blackberry phone being stolen.

He later died after being taken to the Royal London Hospital.

Tonight's Crimewatch programme will feature a reconstruction of the murder, as well as emotional interviews with Negus' family.

Fighting back tears, his mother Ingrid said: “Telling is brother to run and not look back is just him – he wouldn't have thought twice about himself, he was just thinking about protecting his brother.”

Detectives have arrested 12 people, aged between 16 and 20, in connection with murder. All of them have been released on bail.

Detective Chief Inspector Stephen Clayman from the Homicide and Serious Crime Command urged anyone with information to contact his team.

He said: “People may think that incidents such as Negus' murder are not their problem but they have a devastating effect on family, friends and the community as a whole.”

Police are particularly interested in anyone who saw one of the suspects who was wearing a dark coloured hooded jumper with a large 'Franklin and Marshall' logo on the front.

Anyone with information should call the incident room on 0208 345 3775, or Crimestoppers anonymously on 0800 555 111.

The Enfield Independent is launching a campaign to fight back against knife crime in the borough, and thinks that anyone caught carrying a knife should get a mandatory six-month jail term.