Police officers who have the skills to recognise the faces of offenders will be monitoring Notting Hill Carnival in a bid to crackdown on crime at the festival.
The "super-recognisers" will be inside a CCTV control room looking out for people committing crimes, and also anyone with bail conditions which should prevent them attending the event.
It is one of a number of measures that the Metropolitan Police will take in order to ensure revellers can stay safe and enjoy themselves during the carnival, which is marks its 50th anniversary on Sunday and Bank Holiday Monday.
- Facial recognition system to be trialled
The police force will also be trialling a facial recognition system to help identify wanted offenders and suspects, by using cameras which scan the faces of passersby and flags potential matches against a database.
London's "threat level" has been set at "severe" for some time and police have urged those planning to attend the event, to remain vigilant and report suspicious behaviour.
Over the last week, police have arrested a number of people they believe planned to use the carnival as a cover for committing crime or violence.
More than 200 search warrants were also made.
The majority of the arrests were for drugs-related offences, officers also seized six firearms and 50 rounds of ammunition, as well as a number of knives and machetes from the streets.
Superintendent Robyn Williams said: "This weekend is the highlight of the year, not only for the Caribbean community, but also for many visitors from London and the rest of the country.
"The Met has worked hard to ensure that Carnival is a safe and enjoyable weekend for everyone who attends and I would ask all carnival-goers to enjoy this family event and make sure that you follow officers' and stewards' instructions."
His tips for staying safe at the carnival include:
- Checking public transport in advance using the TfL website to avoid stations which may be closed or exit-only
- Going with the flow of the crowd, instead of against it, even if police mark out a longer route. Officers will also be handing out maps of the area at the event
- Having a set meeting place in case you lose family or friends, rather than rely on mobile phones
- Avoiding bringing valuables or too much cash and always being conscious to keep them out of sight, to avoid tempting opportunistic thieves
- Staying alert all the way home, even when the party is over