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Aliki Mamwa, 30, was named on Saturday as the fourth murder victim in the city since last June as a man appeared in court charged with killing him.
Supt Mark Runacres says recent work with the National Crime Agency has identified the gangs in Bristol.
As teenage victims are mourned across the English city, some believe the return of youth centres would keep children safer
The number of youngsters carrying knives has rocketed in the past year, as youngsters in one UK city reportedly 'stash' weapons all over the place.
Officers in Bristol stop and search children as young as 10 in increased efforts to keep people safe.