Four people were arrested today over the fatal stabbing of 16-year-old Ben Kinsella.
The GCSE student and brother of former EastEnders actress Brooke Kinsella was knifed to death when he was caught up in a fight that spilled out of a north London bar early on Sunday.
A Metropolitan Police spokesman said: "Four people have been arrested in connection with the death of Ben Kinsella.
"They are currently in custody in London police stations."
Two 16-year-old boys arrested earlier in connection with the investigation have been bailed to return to a north London police station on a date in late August.
Police believe four black youths of around Ben's age or slightly older were involved in the stabbing.
Officers recovered two knives in the area yesterday, although it is not yet known whether they are connected to the incident.
Miss Kinsella, 24, who played Kelly Taylor in the BBC1 soap, paid tribute to her "true angel" brother at a press conference yesterday.
Ben, who was also a budding actor, died in the arms of his friend Louis Robson, 16, the son of Birds Of A Feather actress Linda Robson.
Robson today made an emotional appeal for tougher penalties for carrying knives.