Notting Hill Carnival security: Facial recognition technology raises concern

Revellers have been swarming onto the streets of west London for Notting Hill Carnival -- Europe's biggest street party.
This year, security has been tightened with the use of facial recognition technology.
Police say it helps identify anyone who poses a public safety risk, but activists say it unfairly targets people from diverse ethnic backgrounds.

Al Jazeera’s Sonia Gallego reports from London.

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