NEW YORK: King Charles III and Queen Camilla visited the site of the Sept. 11 attacks, met with schoolchildren and business titans, and socialized with celebrities during a busy swing through New York City on Wednesday -- the first visit to the city by a reigning British monarch in 16 years.

Charles laid flowers at the National 9/11 Memorial and the royal couple spoke with victims' relatives, first responders, and local dignitaries before traveling to other events midway through a four-day diplomatic trip to the US to mark 250 years of American independence.

The royal couple capped their whirlwind day in the city with an appearance at an early evening reception for one of the king's charities, the King’s Trust, where Charles spoke of the enduring cultural bond between the people of the UK and US as one 'rooted in shared creativity, enterprise, and values.'

The four-day trip is Charles’ first state visit to the US since he became king.

His mother, Queen Elizabeth II, made four state visits to the US.

Her last visit to New York was in 2010.

Honoring victims at the 9/11 memorial

Charles and Camilla began their public schedule in the city by paying tribute to the nearly 3,000 people killed in the Sept. 11, 2001, attacks, including 67 British nationals.

They were greeted at the National 9/11 Memorial plaza in Lower Manhattan by former New York City Mayor Michael Bloomberg and walked to one of the memorial’s two pools, where parapets bear the names of the victims of the attacks.

Charles placed an arrangement of flowers on a parapet before the couple silently bowed their heads in a moment of reflection.

The king and queen then shook hands and exchanged pleasantries with a group of attack survivors, first responders, and victims' relatives, some of whom held photos of their lost loved ones.

The gathering came ahead of the 25th anniversary of the attacks.

The visit to the memorial took place under the usual security precautions New York affords visiting world leaders and heads of state.

Police snipers perched on rooftops, heavy trucks were used as blockers to close off intersections, and the memorial plaza and streets surrounding it were closed to the public.

Meeting New York’s mayor

Among the crowd at the memorial were New York Gov. Kathy Hochul, New Jersey Gov. Mikie Sherrill, and New York City Mayor Zohran Mamdani, all Democrats.

Mamdani — who was born in Uganda to parents from India, both former parts of the British Empire — shook hands with the king, and the two appeared to greet each other warmly.

They spoke only for a few seconds.

Earlier in the day, Mamdani said he hoped to keep the event's focus on 9/11 victims and not pursue a political conversation.

But pressed by a reporter, Mamdani had said that if he were to speak with Charles under different circumstances, 'I would probably encourage him to return the Koh-i-Noor diamond.'

The gem, one of the largest cut diamonds in the world, is part of the Crown Jewels.

Seized by the East India Co. after the Second Anglo-Sikh War of 1849, it was given to Queen Victoria and is on display in the Tower of London.

Countries including India, Pakistan, Iran, and Afghanistan have claimed ownership.

Spending time with 9/11 victims' loved ones

Anthoula Katsimatides was among the Sept. 11 victims’ relatives who spoke with the royal couple.

Her brother, John Katsimatides, died at the World Trade Center.

'I found it extremely sweet that I was allowed to hug the queen,' she said.

'She was quite endearing, as was the king.

I also told him that I thought he was adorable.'

Katsimatides said the queen asked her if she came to the memorial often.

'I said that I do because I find it to be a place of peace and calm and also remembrance,' Katsimatides said.

King visits an urban farm, queen goes to the library

The king also toured an after-school, urban farming effort in Harlem that works with young people affected by food insecurity.

At Harlem Grown’s 134th Street Farm, he planted lavender and mustard seeds with children, saw a chicken coop, and watched a live food demonstration that educated children about food and nutrition.

'I like your hair,' a student told the king, who replied, 'Do you?

Good.'

Later, the king attended a gathering of business leaders at Rockefeller Center, including executives from top American companies, such as Google, OpenAI, JPMorgan Chase, and Comcast.

The queen, meanwhile, visited the New York Public Library, where she chatted with actress Sarah Jessica Parker during a walk through the building as a crowd of onlookers watched from across Fifth Avenue.

Camilla delivered a new Roo doll to add to the library’s famed collection of Winnie-the-Pooh stuffed animals.

The beloved children's character turns 100 this year.

The five dolls currently on display -- Winnie-the-Pooh, Piglet, Tigger, Eeyore, and Kanga -- were the inspiration for the characters in A.A. Milne’s children's books.

They were owned by the English author’s son, the real-life Christopher Robin, in the 1920s.

The dolls were donated to the library in 1987 and are a centerpiece of the library’s collection of children's literature.

Roo, in the books, was a small brown kangaroo and the son of Kanga.

A charity gala

Earlier in the week, the king and queen joined President Donald Trump and first lady Melania Trump for events at the White House.

The king delivered a rare speech before Congress -- the first by a British monarch since his late mother in 1991 -- followed by a formal state dinner at the White House.

The monarchs are expected to make stops in Virginia before wrapping up their US visit back at the White House on Thursday with a formal farewell from Trump.

Charles then travels solo to Bermuda on his first visit as king to a British overseas territory.

In their last public event of the day in New York on Wednesday, the king and queen attended a gala reception at Rockefeller Center.

Singer and songwriter Lionel Richie, who has worked with the King’s Trust for four decades, introduced the royal.

Also present were Vogue editor-in-chief Anna Wintour, lifestyle icon Martha Stewart, and fashion designer Donatella Versace.

The king closed his brief remarks in a packed wing of the gallery space by joking that he was disappointed he wouldn't get to hear Richie sing.

'I don’t know how he does it.

He must gargle with port or something.'