Special measures are being taken to protect Notting Hill Carnival from the threat of terrorism and acid attacks, Scotland Yard has said.
Steel barriers and a ban on vehicles during the daytime will be in place over the bank holiday weekend to stop a terror attack.
David Musker, the commander in charge of policing the west London event, said there was no specific counter-terrorism intelligence but security plans had been "thoroughly reviewed" after the Barcelona attack, in which 15 people died after being hit by a van.
Officers will be stationed around the perimeter of the carnival zone, carrying out checks for weapons and acid, following a controversial three-week crackdown to reduce criminality at the event.
There will also be a protective ring of officers around Grenfell Tower and the Lancaster West estate to protect the space from carnival-goers and ensure a "respectful" two days.
A three-week crackdown on crime ahead of the carnival saw 656 people arrested by 7am on Friday, and a large number of knives, guns, weapons and money seized, the Metropolitan Police said.
Last year more than 450 people were arrested over the two days of festivities, with around 300 detained in the preceding crackdown.
The force hit back after being widely ridiculed for linking this year’s operation to the carnival, with Mr Musker saying: "I think the public would expect us to do what we can to prevent those injuries to people coming to carnival."
He added that the point had been "to get people who would normally come to carnival to cause problems off the street before the event".
It comes as the National Police Chiefs Council warned the public to stay safe over the bank holiday weekend, with a number of sporting events and festivals planned.
Mr Musker said he was confident in the Met's policing plan in response to an observation that the force had a "unprecedented amount on its plate", in terms of the terror threat, Grenfell Tower fire and rise in acid attacks.
While extra officers will be stationed around Grenfell Tower in a "ring of care", overall policing numbers will stay the same as last year, with approximately 15,000 shifts worked over the two days.
This works out as around six to seven thousand officers on duty each day.
Facial recognition technology will be used, and "super recognisers" will also be in place in an attempt to weed out troublemakers from the throng.
Mr Musker said he was "not blind to the fact that this is a controversial tactic", adding the Met had consulted with privacy groups such as Big Brother Watch "to ensure that what we are doing is proportionate, legal and effective".
He added: "It's not loaded, it's loaded with people who we know are involved with criminality, who are wanted.
"It's not a speculative search tool."
Large steel barriers and concrete blocks will be in place to stop cars or other vehicles entering the carnival space.
Vehicles such as floats will not be able to enter or leave the area before 9am and after 7pm.
Chief superintendent Robyn Williams, responsible for community engagement, said the carnival would look different to people, with large concrete slabs erected from 6am on Sunday "to keep vehicles and any other large obstacle from actually entering into the footprint" of the carnival.
Officers will also have nitrile gloves, extra water supplies and testing facilities for corrosive substances following an alarming spate of acid attacks in the capital over the past few months.
Mr Musker said: "People should be under no illusion that if they think they can swan in with a bottle of Lucozade with acid in and not be able to be detected by police, we have the methods, the people, the highly-trained professionals, and we will look at them, and I will press for them to be arrested and charged and brought before the courts."