Thousands of police, hundreds of British troops and an army of officials made final preparations Sunday for the state funeral of Queen Elizabeth II a spectacular display of national mourning that will also be the biggest gathering of world leaders for years, the Associated Press (AP) reported. U.S. President Joe Biden and other world leaders have flown into London for the funeral, to which around 500 royals, heads of state and heads of government from around the globe have been invited. As the dignitaries poured in, the clock was ticking down for those seeking a place in most massive queue any of them have ever seen to file past the queen’s coffin as it lies in state at Westminster Hall. The miles-long queue is expected to be closed to new arrivals later Sunday so that everyone in line can view the coffin before Monday morning, when it will be taken to Westminster Abbey for the queen’s funeral. Family by family, thousands of people kept lining up around the clock, braving chilly overnight temperatures and waits of up to 17 hours in a queue that stretched for over 5 miles (8 kilometers). Lauren Wilson, a 36-year-old student, was in the much shorter queue for people with mobility issues. She said she wanted to experience in person the coffin lying in state. "The world is in such a weird place and then this happened. It feels more momentous," she said. She worried that the pageantry surrounding Elizabeth’s death deprives the queen’s relatives of the ability to come to terms with their loss. "The family are not allowed to grieve. I find it quite heartbreaking," she said. The queen’s eight grandchildren, led by heir to the throne Prince William, circled the coffin and stood with their heads bowed during a silent vigil on Saturday evening. Among the foreign leaders in London was New Zealand Prime Minister Jacinda Ardern, who told the BBC she was humbled to represent her nation at the funeral and to witness the national outpouring of grief and respect for the late queen. "The thing that I will take away from this period is just the beauty of the public’s response, the kindness that you see from members of the public, the patience, the camaraderie. That has been, for me, the most moving tribute of all, has been the public response of the British people," she said. King Charles III was holding a reception for heads of state and other leaders Sunday evening at Buckingham Palace. People across the U.K. will also pause Sunday evening for a nationwide minute of silence to remember the queen, who died Sept. 8 at 96 after 70 years on the throne. Monday has been declared a public holiday, and the funeral will be broadcast to a huge television audience worldwide and screened to crowds in parks and public spaces across the country. Police officers from around the country will be on duty as part of the biggest one-day policing operation in London’s history. Crowds also gathered Sunday near Windsor Castle, where the queen will be laid to rest at a private family ceremony on Monday evening. — Agencies