As tens of thousands of people poured into London ahead of Queen Elizabeth's state funeral, entry to the long queue of mourners waiting to see her lying in state was temporarily closed after the line swelled to capacity.
People of all ages and from all walks of life have paid their respects to the late queen, joining a well-organised line that stretches along the south bank of the Thames then over the river to parliament's Westminster Hall
But by mid-morning, the line was just too big - a testimony to the public's respect and affection for the queen, who died in Scotland on September 8 at the age of 96 after a 70-year reign
"Entry will be paused for at least 6 hours," Britain's culture department said. "Please do not attempt to join the queue until it re-opens."
It warned of waiting times of up to 12 hours. Some 750,000 people in total are expected to file past the queen's coffin.
On Friday night, King Charles and his sister Princess Anne and brothers Princes Andrew and Edward will keep a silent vigil around the coffin, joining the ceremonial guard for a 15-minute period.
A mourner from London, Naomi Brown, said she waited for nearly 11 hours after joining the queue on Thursday night after work.
"I just thought, I'm never going to do it again. I have so much respect for the queen, not once did she ever falter," 29-year-old Brown said, speaking to Reuters as she neared the front of the queue.
"It feels like we have lost a family member."
The coffin stands in the ancient Westminster Hall on a purple catafalque, draped in the Royal Standard and with the bejewelled Imperial Crown of State placed on top.
Soldiers in ceremonial uniform are keeping vigil around it as people walk past to pay homage, many in tears.
King Charles, meanwhile was visiting Wales, the last stage of a tour of the UK to acknowledge his status as the new monarch and head of state and to greet the public mourning the loss of Elizabeth.
Charles and his wife Camilla, the Queen Consort, attended a service at Cardiff's Llandaff Cathedral then greeted cheering well-wishers outside. He was also visiting the Welsh parliament and meeting Welsh first minister Mark Drakeford.
Wales has a particular significance for the new king, who for five decades preceding last week's accession had the title Prince of Wales.
The queen's eight grandchildren, including the new Prince of Wales, William, and his brother Harry will stand vigil at the coffin on Saturday evening.
In an adjustment to protocol, both Harry and his uncle Prince Andrew will be allowed to wear military uniform when they take their turns, royal officials said.
Both are war veterans, Andrew having served as a Royal navy helicopter pilot in the Falklands War and Harry serving two tours of duty with the British Army in Afghanistan.
But so far they have appeared in processions in morning suits as they lost their honorary military titles when they stepped back from public royal duties.
William was on Friday visiting troops from New Zealand, Canada and Australia who are in Britain to take part in events around the state funeral.
He was accompanied by his wife Kate , the new Princess of Wales. The title was previously held by William's mother Diana, killed in a car crash in 1997.
William spoke on Thursday of how the solemn events of the last week had revived memories of the funeral procession for Diana.
On Wednesday, William, alongside Charles and Harry, walked in a procession behind a gun carriage carrying the queen's coffin from Buckingham Palace to the Palace of Westminster, a scene reminiscent of when, as boys 25 years ago, the princes had followed Diana's casket.
"The walk yesterday was challenging ... brought back a few memories," William said as he and Kate spoke to well-wishers outside the royal residence of Sandringham in eastern England.