Image source, PA MediaImage caption, Police outside Brent Civic Centre, which is closed while an investigation is ongoing
A total of three people have now been charged with murder over the fatal stabbing of a 17-year-old boy at Brent Civic Centre in Wembley.
David Wynter died after he was attacked on Engineers Way at about 14:30 BST on 25 August.
A 15-year-old boy was charged with murder two days later, and two more teenagers - a 17-year-old boy and 18-year-old Jahquarn St Hillaire - were charged with murder and possession of an offensive weapon on Saturday.
The 15-year-old was remanded in custody and is due to appear at the Old Bailey on 24 September, with the other pair due at Willesden Magistrates' Court on Monday.
A 20-year-old man, Diego Farquharson, of Birchen Grove, Brent, has been charged with assisting an offender and is due to appear before magistrates on Monday.
Wynter's family continue to be supported by the force, the Metropolitan Police said.
Police said their investigation was ongoing and urged anyone with information or footage to come forward.
Extra patrols have been deployed in the area following the stabbing.
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