William and Harry were later seen placing flowers on a memorial on the gates of the palace, where many members of the public have already left tributes.
Video: William and Harry place floral tributes from the waiting crowds outside the gates at Kensington Palacw, Diana's former home. pic.twitter.com/8Z34558noZ
Catherine, Duchess of Cambridge smiles as he talks to staff and young people during a visit to a Christmas party for volunteers at The Mix youth service on Dec. 19, 2016 in London, England.
A cub scout uses a neckerchief to show Britain's Catherine, Duchess of Cambridge, how to support a broken arm, during a Cub Scout Pack meeting with cubs from the Kings Lynn District, in Kings Lynn, eastern England, on Dec. 14, 2016.
The Duchess of Cambridge attends Place2Be Wellbeing in Schools Awards at Mansion House on Nov. 22, 2016 in London, United Kingdom.
The Duchess of Cambridge meets pupils in a wool class during a visit to the De Bouwkeet Work Space in Rotterdam, the Netherlands on Oct. 11, 2016.
The Duchess of Cambridge and Princess Charlotte after a ceremony to mark their departure at Victoria Harbour seaplane terminal in Victoria during the Royal Tour of Canada on Oct. 1, 2016.
The Duchess of Cambridge inside the Carving House at the Haida Heritage Centre and Museum at Skidegate on Sept. 30, 2016 on the island of Haida Gwaii, British Columbia during the Royal Tour of Canada.
The Duke and Duchess of Cambridge go on a fishing trip on the Highlander Ranger boat after visiting Skidegate Youth Centre on the island of Haida Gwaii on Sept. 30, 2016 during the royal tour of Canada.
The Duchess of Cambridge with her daughter Princess Charlotte at a children's party for Military families at Government House on Sept. 29, 2016 in Victoria during the Royal Tour of Canada.
Britain's Catherine, Duchess of Cambridge (L), walks with Lucy Dorrien-Smith after visiting Tresco Abbey Garden in Tresco, in the Isles of Scilly, Britain Sept. 2, 2016.
Britain's Prince William and his wife Catherine, Duchess of Cambridge, travel by boat to St Martin's, after visiting Tresco Abbey Garden in Tresco, in the Isles of Scilly, Britain Sept. 2, 2016.
Britain's Prince William and Catherine, Duchess of Cambridge, visit Healey's Cornish Cider Farm near Newquay in Britain Sept. 1, 2016.
Britain's Catherine, Duchess of Cambridge, shakes hands with a patient during her visit to Keech Hospice Care in Luton, Britain, Aug. 24, 2016.
Britain's Prince William and Catherine, Duchess of Cambridge are presented with a personalised memory jar by Jamie Coniam and Ethan Coniam (L) during their visit to Keech Hospice Care in Luton, Britain, Aug. 24, 2016.
Britain's Prince William and Catherine, Duchess of Cambridge, pose for a picture with participants of the Wave Project, an organization that uses surfing as a tool to reduce anxiety in children and improve their mental wellbeing, on Newquay's Town Beach, Britain Sept. 1, 2016.
Catherine, the Duchess of Cambridge arrives at the launch of their Heads Together campaign to eliminate stigma on mental health at Queen Elizabeth Olympic Park, in London, Britain, May 16, 2016.
Britain's Kate, the Duchess of Cambridge, boards a catamaran with sailor Ben Ainslie as she visits Land Rover BAR and the 1851 Trust in Portsmouth, May 20, 2016.
Britain's Catherine, Duchess of Cambridge reacts during a visit to the offices of the charity Action on Addiction in Warminster in south west England in Britain, Dec. 10, 2015.
Britain's Kate, the Duchess of Cambridge, boxes during a Heads Together mental health campaign launch in Stratford, East London, May 16, 2016.
Britain's Catherine, Duchess of Cambridge visits the Magic Garden at Hampton Court Palace near London, Britain May 4, 2016.
Catherine, the Duchess of Cambridge, is seen on a safari at Kaziranga National Park in the northeastern state of Assam, India, April 13, 2016.
Britain's Catherine, Duchess of Cambridge reacts after shooting an arrow at Changlimithang Archery Ground in Thimphu, Bhutan, April 14, 2016.
Britain's Prince William and his wife Catherine, the Duchess of Cambridge, feed baby elephants at the Centre for Wildlife Rehabilitation and Conservation (CWRC) at Panbari reserve forest in Kaziranga, in the northeastern state of Assam, India, April 13, 2016.
Britain's Catherine, Duchess of Cambridge, plays cricket with children at a ground in Mumbai, India, April 10, 2016.
Britain's Catherine, Duchess of Cambridge, attends a Place2Be meeting at St Catherine's Primary School in Edinburgh, Scotland, Britain Feb. 24, 2016.
Britain's Catherine, Duchess of Cambridge arrives at the Place2Be Headteacher Conference at Bank of America Merrill Lynch, in London, England, Nov. 18, 2015.
Britain's Catherine, Duchess of Cambridge takes part in a tennis workshop with Andy Murray's mother Judy at Craigmount High School in Edinburgh, Scotland, Britain, Feb. 24, 2016.
Britain's Catherine, Duchess of Cambridge, speaks on a telephone as she attends a charity event at city company ICAP, in central London, Britain Dec. 9, 2015.
Britain's Kate, Duchess of Cambridge, visits a charity shop in Holt, Norfolk, eastern England, March 18, 2016.
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge sit as stories are read to children at the McBride Museum on Sept. 28, 2016 in Whitehorse, Canada.
The Duke and Duchess of Cambridge taste local foodstuffs during a visit to the Mission Hill winery in Kelowna, Canada, on Sept. 27, 2016, the fourth day of the royal tour to Canada.
The Duchess of Cambridge on the island of St Martin's during their visit to the Isles of Scilly on Sept. 2, 2016.
The Duchess of Cambridge listens in to real calls during a visit to YoungMinds in London, a helpline service run by one of the eight charity partners of their Heads Together mental health campaign on Aug. 25, 2016.
The Duchess of Cambridge watches the action on court 17 with AELTC Chairman Philip Brook, Gill Brook (left), Sophie, The Countess of Wessex and Rebecca Deacon (right) on July 17, 2016, day ten of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon.
The Duchess of Cambridge smiles as she visits the Canadian Coast Guard and Vancouver First Responders Event at Kitsilano Coastguard Station in Vancouver, Canada on Sept. 25, 2016.
Princess Charlotte of Cambridge and Catherine, Duchess of Cambridge attend for the wedding Of Pippa Middleton and James Matthews on May 20, 2017.
Australian men are being urged not to neglect their health after a squash coach who thought he had a sports injury was diagnosed with advanced prostate cancer.
Alexander Zverev was far from happy with drizzly conditions in Germany but his pleas for the match to be suspended were ignored and he slipped to defeat.
Brisbane's New Farm Park will host a memorial service for Qantas flight attendant Luke Davies two months after he and his partner were killed in Sydney.
Manchester City manager says his side must not feel sorry for themselves after Champions League let-down as they prepare for FA Cup semi-final with Chelsea.
Ukraine and Israel are in "two theatres of the same war" and the West should be supporting both, Ukraine Foreign Minister Dmytro Kuleba has told the G7.
Wellington's ALM premiership campaign will go down to the final game of the season after captain Alex Rufer fell short of the match-winner against Newcastle.
