The "casual" acceptance of knives led to the death of 16-year-old Hani Hicham Abou El Kheir, a Metropolitan Police officer said after five men were sentenced to life in prison.
After sentencing, Detective Chief Inspector Neil Attewell said:
Hani had been out with friends when he was chased and set upon en masse.
The frenzied attack through the streets of Pimlico left at least two of the gang members with injuries, which gives a clear indication of the ferocity at which they attacked Hani. Sadly Hani stood very little chance of being able to escape.
Five men were jailed for life over the murder 16-year-old Hani Abou El Kheir, who was stabbed to death in Pimlico last January.
The teenager was assaulted with weapons including swords, a meat cleaver, knives and a Taser stun gun.
Hani Abou El Kheir was stabbed more than 20 times while walking through an estate in Pimlico.