Two teenage boys have been arrested in the investigation of the murder of Vijay Patel.
The two boys, aged 15 and 16, were arrested on suspicion of violent disorder on January 10.
Both remain in custody in a central London police station.
Police were called to The Broadway in Mill Hill after 49 year old shopkeeper Mr Patel, from Colindale, was reported as injured.
He and another shopkeeper had been assaulted and while the other shopkeeper had minor injuries, Mr Patel died in hospital on Monday.
Another 16 year old boy has been charged with murder and appeared at Willesden Magistrates' Court on January 10.
He is in custody and will appear at the Old Bailey on January 12.
Anyone with information is asked to contact the Incident Room on 020 8358 0200 or call Crimestoppers anonymously on 0800 555 111.
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