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The 16-year-old boy was arrested on suspicion of murder on Monday, 16 November. He remains in custody at a north London police station.
Police were called at 3.50pm on Thursday, 12 November to Northwick Park in Harrow, following reports of a stabbing close to the underpass leading to Northwick Park Underground Station.
Officers attended, and a 17-year-old was found suffering from stab injuries. He was given first aid at the scene by officers prior to the arrival of the London Ambulance Service. Despite the best efforts of emergency services, he was pronounced dead at 16:31hrs.
He has been named as Jamalie Maleek Deacon Matthew, who was from the Harrow area.