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A year after a 15 year old was stabbed to death in Edmonton police are using Facebook to help catch Negus McClean's killer.
The new appeal will run on the MET police Facebook page all week reminding Londoners a £20,000 reward is still being offered for information.
16 people have been arrested and bailed.
It comes as a 15 and 16 year old recover in hospital after being stabbed in New Cross on Monday night.