A Section 60 order that provides police officers with additional powers to search people at the Notting Hill Carnival, was authorised at 11.30am and will expire at 2am tomorrow morning (August 29) .
The Met said it is not a continuation of the order authorised on Sunday (August 27) that expired at 2am on Monday.
The decision was taken following intelligence concerning weapons, the Met said.
Members of the community who volunteer to advise the Met Police during the policing operation for Notting Hill Carnival were consulted on the decision, as well as the local authority and other emergency service.
Met Police Deputy Assistant Commissioner Ade Adelekan said: “The introduction of today’s s60 order does not change the policing style we have adopted for the event, and our officers will continue to provide a professional, respectful presence and sensitive approach to crowds to ensure the event can be enjoyed safely by all.”

Colourfully-costumed revellers paraded through the streets on Monday marking the climax of the carnival.
The annual celebration of Caribbean culture and history saw thousands take part in an exuberant adult parade.
People were partying atop floats followed by feathered mas bands dancing to the beat.
Meanwhile the sweet, smoky scent of jerk chicken filled the side streets where sound systems played everything from rare groove to house, samba, reggae and ska.
It is expected that more than two million people will have taken to the streets of Notting Hill by the end of the bank holiday as the carnival, Europe’s biggest street party, celebrates two landmark anniversaries.
The introduction of sound systems and mas bands 50 years ago transformed it into a large-scale event and the docking of the Empire Windrush 75 years ago heralded mass immigration from the Caribbean.
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