Two more teenagers have been arrested by detectives investigating the murder of a shop worker who was attacked after refusing to sell cigarette papers to some youths.
Father-of-two Vijay Patel, 49, from Colindale in north London, was assaulted at the Rota Express convenience store in The Broadway, Mill Hill, on Saturday night and died the following day.
A 16-year-old from north west London has been charged with his murder.
The Metropolitan Police said on Thursday that two other youths had been arrested following the release of CCTV images linked to the incident.
The boys, aged 15 and 16, attended a central London police station on Wednesday evening and were arrested on suspicion of violent disorder.