A man carrying a sword in east London killed a teenage boy and left several others injured, including police officers, during an attack Tuesday morning.
A 36-year-old suspect was Tasered and then arrested at the scene.
Footage from a bystander showed a man wearing a yellow sweater walking on the roofs of low-rise homes in a residential area in Hainault, a northeast area of London.
A police officer yells, 'drop your sword,' before warning residents to 'lock your doors.'
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