Questions are arising around the Police response to a fatal sword attack in London. 

A 36-year-old man has been arrested after a 14-year-old boy was killed in the incident near the suburb of Hainault. 

Four other people were injured including two officers. 

UK correspondent Gavin Grey told Mike Hosking that the Police's response time will likely be looked at. 

He says it took officers 22 minutes to arrive at the scene and taser the man.

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• Schoolboy killed after sword-wielding man attacks passersby in London