Detectives investigating a stabbing in Harrow have released an image of a man they want to trace as part of their investigation.
Officers had approached the man to arrest him for misuse of the 999 system
Detective Sergeant John Millward said: “This callous attack left the victim shaken and with cuts, bruising and swelling to his face.
Detectives are appealing for information following the fatal stabbing of Drekwon Patterson
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