Close to a million people were at the event for Adults Day on Monday, as the streets were once again filled with the boom of sound systems and dancers in extravagant costumes.
Police earlier said there had been 76 arrests for "a variety of different offences" by 7am on Monday.
A police horse also died on duty during after collapsing at around 9pm on Sunday.
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There were 72 seconds of silence on Monday afternoon to mark the 72 people killed in the fire at nearby Grenfell Tower - one of several gestures held over the weekend to remember the tragedy.
Notting Hill Carnival celebrates Caribbean culture and is Europe's biggest street party, and second only in size to the carnival in Rio de Janeiro in Brazil.
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The 2020 carnival was cancelled because of COVID, although there were live-streamed events, and last year's event was also scrapped due to coronavirus risk.
The UK's largest warship which broke down off the south coast soon after setting sail for the US has been moved so it is in a better location to be inspected.
HMS Prince of Wales, the second of the Royal Navy's two aircraft carriers, left Portsmouth Naval Base in Hampshire on Saturday before experiencing an "emerging mechanical issue", a navy spokesperson said. The problem is being investigated.
The vessel's departure had earlier been delayed from Friday because of a technical issue, although it is not known if the incidents were related.
The £3bn carrier, which became fully operational only last year, was at one point anchored to the southeast of the Isle of Wight.
Its position was shown on MarineTraffic.com before it appeared to be moved a number of miles north and then west.
It was reportedly being taken slowly towards Stokes Bay, Gosport, where it is understood the sheltered area will make it easier for divers to examine the damage.
A tweet from the Royal Navy read: "You might be aware of issues with @HMSPWLS since leaving her home port of Portsmouth on Saturday.
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"We are in the process of moving her to a different anchorage which is better suited to allow for further inspection of the ship."
Another navy tweet said: "Right now our focus is on the ship and our people; everyone is working hard to understand the problem and what can be done next."
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The problem was first reported by UK Defence Journal, an online news site focused on defence issues, which cited unconfirmed reports about damage to the starboard propeller shaft.
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£3bn aircraft carrier broken down at sea
A second specialist news site, Navy Lookout, said the 65,000-ton warship had suffered a "significant technical fault".
"Should the issue prove to be serious it goes without saying that this is extremely unfortunate and not a good look for the RN [Royal Navy]," it reported.
It stated that, unless the problem can be resolved at sea enabling the warship to continue its journey to the US, it might need to go into dry dock at Rosyth, Scotland, early ahead of a planned inspection in 2023.
The warship had departed at the weekend on what was described by the Royal Navy as a mission to "shape the future of stealth jet and drone operations off the coast of North America and in the Caribbean".
The trip - provided it goes ahead - is set to see the carrier visit New York, Halifax in Canada and the Caribbean, operating fifth generation F-35 fast jets off the deck as well as drones.
HMS Prince of Wales, which heads a carrier task group, deployed with a frigate, tanker and an air group of helicopters and drones.
The F-35 warplanes are set to join the ship in the US.
A crackdown on serious and organised crime has seen Merseyside Police arrest 170 people over the past week.
Officers have carried out dozens of raids as they continue to appeal for help in finding Olivia Pratt-Korbel's killer.
The nine-year-old was fatally shot inside her own home last Monday, becoming the third person in Merseyside to lose their lives to gun violence in one week.
Sam Rimmer was killed in a drive-by shooting on 16 August, while Ashley Dale was murdered in her back garden on 21 August.
In a statement, Merseyside Police said it has executed 58 warrants in locations across Liverpool, Knowsley and St Helens.
Some 46 vehicles have also been seized in the past seven days, with two firearms recovered.
Detectives also revealed that they have received over 280 submissions of intelligence from people reporting organised crime.
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"We hope these figures and the relentless work of our officers over the past week shows our commitment in targeting anyone involved in organised crime and removing dangerous weapons and drugs from out streets," Detective Chief Superintendent Mark Kameen said.
Yesterday, "rummage search" dogs were seen in a cordoned area around Olivia's house - with officers making door-to-door enquiries.
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In a fresh appeal on social media, featuring pictures of the schoolgirl, police said: "You know her name, now we need the name of her murderer."
The post also showed pictures of Sam Rimmer and Ashley Dale, and warned the public: "Silence is not an option."
It added: "If you've got information, and you're withholding it, you are protecting the killers. We need your information. Provide that information to us, and we'll do the rest."
Merseyside Police said anyone with information can contact them via social media or by calling 101.
CCTV, dashcam, and smart doorbell footage can be submitted online via mipp.police.uk.
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Moment police arrest Olivia murder suspect
Over the weekend, police investigating Olivia's killing released on bail two men who had been arrested and questioned on suspicion of murder and two counts of attempted murder.
They were a 36-year-old man from Huyton and a 33-year-old man from Dovecot. The 36-year-old has been recalled to prison after breaching the terms of his licence.
Police have issued an image of a man they are hunting after a woman was raped in bushes in Gloucester.
The attack happened close to a petrol station between 8pm and 8.40pm on Friday, officers said.
A man met the victim at the bus station before they walked to the Horton Road area, Gloucestershire Police said.
He raped her near the Gulf petrol station and then fled, the force added.
The man is described as "white or of mixed race, wearing a black t-shirt with a yellow motif". He also wore black jogging bottoms and black Adidas sliders.
He was carrying a black "man bag" and a white carrier bag.
The victim is now receiving specialist support.
Anyone who sees the man or knows his current whereabouts is urged to call 999.
Alternatively, information can be provided via an online form, quoting incident 512 of 26 August.
Performers in brightly-coloured costumes have marked the return of the Notting Hill Carnival after a two-year hiatus during the COVID pandemic.
Dancers, brass bands and floats entertained the large crowds in west London on what is known as 'family day'.
Millions of people are expected to attend the festival which in is celebration of Caribbean heritage. The event lasts until Bank Holiday Monday.
There was also a substantial police presence to prevent disorder.
London mayor Sadiq Khan tweeted: "Biggest street party in Europe! And the vibes are immaculate."
He said it had "become one of the world's biggest street festivals and part of the very fabric of this city".
This year's event comes amid a cost-of-living crisis, which Mr Khan said had affected the carnival.
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He said: "We are seeing those who want to have floats, those who want to have sound systems, pulling out because they can't afford to pay their bills. It is really important the government steps up."
At the first in-person Notting Hill Carnival since 2019, the 72 people who died in the Grenfell Tower fire were remembered five years on from the tragedy.
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Dressed in green T-shirts with "Remembering Grenfell" emblazoned on the back, members of the Emancipated Run Crew running group joined the carnival parade from Great Western Road on Sunday morning in tribute to the victims.
Speaking to the crowd at the start of the route, Grenfell survivor Zoe Dainton reflected on the five-year anniversary.
She said: "June the 14th of this year marked five years since the fire. Five years (and) still no justice, still no charges, not much change."
There was a 72-second silence before the parade began and Ms Dainton cut the ribbon for the runners, marking the official start of carnival.
Jules Stephenson, 48, co-founder of the Emancipated Run Crew, said: "For the last couple of years we have run the carnival route in celebration of Notting Hill and it is just amazing to be part of the opening proceedings this year to also mark the 72 lives lost in the Grenfell tragedy.
"It is really important that we don't forget, that we mark those lives, and we just remember those lives."
The 2020 carnival was cancelled because of COVID, although there were live-streamed events, and last year's carnival did not take place either due to the coronavirus risk.
Notting Hill Carnival has returned to west London's streets for the first time in two years.
The Covid-19 pandemic forced the event to be put on hold in 2020 and 2021.
Sunday's event began with a run to remember the 72 victims of the Grenfell Tower fire and a 72-second silence was held at 15:00 BST.
Mayor of London Sadiq Khan said he would "never forget" the tragedy that took place in June 2017 and said the community wanted "justice".
"What the community wants is two main things," Mr Khan said.
"One is for justice to happen and for those responsible be held to account and that still hasn't happened. And secondly for this to never happen again."
The carnival's chief executive, Matthew Phillips, said although the pandemic had affected previous years, this year the cost of living crisis was the biggest worry.
He said some bands could not appear and the flamboyant costumes that featured in the main parade would be unaffordable for some.
Linett Kamala, who is on the carnival's board of trustees, said it had been expensive to stage the event.
"It is a free event but there's absolutely a cost to all of us involved in terms of materials, equipment hire, and storage hire," she said.
"It's been tough for all of the carnivalists, we've been affected by the pandemic too, but that's not deterred us, people will see an amazing carnival this year."
Marelle Steblecki, 29, said she was "excited" to finally wear a costume she had planned to wear pre-pandemic.
"I've had my particular costume, which is rose gold, purple and teal booked with my carnival band since 2018, so I've been waiting to wear this for two years," she said.
"The carnival band that I'm playing with chose their theme as Africa. It is good for people to see that there are true influences behind each costume."
Sadiq Khan urged everyone attending to arrive early and to make the most of the celebration.
"This community-led celebration of Caribbean history and culture has become one of the world's biggest street festivals and part of the very fabric of this city," he said.
There would be another 72-second silence at 15:00 BST on Monday to honour those who died in the Grenfell tragedy, organisers said.
The blaze destroyed Grenfell Tower on 14 June 2017, claiming the lives of 72 residents.
Organisers said on Twitter: "We ask all those planning to attend this year's carnival and the participating bands and sound systems to work with us as organisers and the community to help pay our respects.
"We stand by the Grenfell community and support them wholeheartedly."
Notting Hill Carnival
The event takes place on the August Bank Holiday in Notting Hill, Westbourne Park and parts of Kensington
The spectacle of music, dancing, food and drink is rooted in Caribbean culture, and has been influenced by the Windrush generation
Over the past 55 years it has grown to become the second-biggest carnival in the world, after the one held in Rio de Janeiro
The event aims to "promote unity and bring people of all ages together"
The first festival was put on by Rhaune Laslett, who lived in Notting Hill and wanted to highlight and celebrate the diversity in her area
The Metropolitan Police said thousands of officers were on duty to keep the public safe.
Commander Dr Alison Heydari said: "Being able to attend Carnival in person has been sorely missed for the last couple of years, so we are expecting large crowds in the Notting Hill area this weekend.
"We are also working to keep the area safe with the festival organisers implementing 'safer spaces' where women and girls can go and seek advice from specially trained professionals, as well as the police.
"Our officers are here to help you, if you feel like something doesn't look right please speak with us."
Police have made a fresh appeal for information to find the killer of nine-year-old Olivia Pratt-Korbel in Liverpool, saying "you know her name, now we need the name of her murderer".
Officers said she won't celebrate her 18th birthday, marry or have children as her life was cut short.
In a social media post, Merseyside Police released a video showing images of the schoolgirl who was fatally shot at her home in the Dovecot area last Monday evening, along with photos of two other recent gunshot victims in the city, Sam Rimmer and Ashley Dale.
It comes as police "rummage search" dogs have been seen today in a cordoned area around Olivia's house.
At one point, officers lifted a dog on to the top of a hedge as part of the search.
Sky's Emma Birchley, at the scene, said: "We've seen detectives knocking on doors. There's a real momentum to try to move forward this investigation."
Officers have appealed for the public to name those who killed them, saying "silence is not an option" and people who might be withholding information were warned they are protecting murderers.
A voice-over in the video says: "We've got parents who've lost children. We've got a nine-year-old who won't celebrate her 18th birthday, she won't celebrate her wedding, she won't have children of her own."
It added: "If you've got information, and you're withholding it, you are protecting the killers. We need your information. Provide that information to us, and we'll do the rest."
A caption with the post said: "The progress we've made in seeking justice for Olivia Pratt-Korbel, Ashley Dale & Sam Rimmer is thanks to info from the public.
"Sadly we now all know Olivia, Ashley & Sam's names. Now we need their killer's."
Merseyside Police said anyone with information can contact them via social media or by calling 101.
CCTV, dashcam, and smart doorbell footage can be submitted online via mipp.police.uk.
Council worker Ms Dale, 28, was found fatally wounded in the back garden of a house in Old Swan on Sunday 21 August. It is believed she was not the intended victim.
Mr Rimmer, 22, was shot in Dingle on Tuesday 16 August.
'Enormous community support'
A church service is being held in Liverpool today to remember Olivia.
Metro mayor for Liverpool City Region, Steve Rotheram, told Sky News: "The community support here is enormous. You'll see solidarity like nowhere else. People do help each other out in times of crisis. And this is one such event. And so it's great that the church is helping those people hopefully to grieve and to come to terms with what's happened over this last week."
He added: "There's already growing anger at something of this magnitude happening. And so you can understand the devastation of people who really can't get their heads around what's happening so close to where they live."
Murder suspects released on bail
Police investigating Olivia's killing yesterday released on bail two men who had been arrested and questioned on suspicion of murder and two counts of attempted murder.
They were a 36-year-old man from Huyton and a 33-year-old man from Dovecot. The 36-year-old has been recalled to prison after breaching the terms of his licence.
Following their release, Sky's Emma Birchley said: "Having spoken to people around here, there was a sense of anger last night and disappointment.
"One mum said she was devastated, she'd really hoped the police had got the right person, but clearly they feel they have insufficient evidence to be able to charge anybody at this stage."
Officers were also seen carrying a door away from the scene of the attack, while Merseyside Police continues to seek information about a car.
"We are still appealing to anyone who saw a black Audi Q3 in the days leading up to the shooting, or has any information about its movements after leaving Kingsheath Avenue on the night of the shooting," the force said.
Liverpool captain Jordan Henderson wore a shirt at Anfield on Saturday with the message: "RIP Olivia, YNWA" (you'll never walk alone).
The schoolgirl was shot after a gunman chased his intended target, who has been named as 35-year-old convicted burglar Joseph Nee, into her family home.
Her mother Cheryl, 46, was injured in the shooting.
Anyone with information is asked to message @MerPolCC or contact Crimestoppers on 0800 555 111.