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25 August 2013, 12:36 | Updated: 25 August 2013, 12:38
Around a million people are expected to visit the Notting Hill Carnival this weekend.
The Met police are using a team of 'super recognisers' for the first time, to try and tackle crime.
They have got photographic memories and will watch live CCTV of the carnival to spot known troublemakers and potential criminals.