The coffin of Muhammad Ali has begun its journey across the boxing great's home city of Louisville, Kentucky as fans and loved ones say a final farewell to "the greatest".
Thousands of people have lined the streets for the procession which is making its way past the Muhammad Ali Centre before continuing across the city to Cave Hill Cemetery for a private burial.
The casket, covered in a cloth bearing Arabic writing, was placed into a limousine by pallbearers before leaving the funeral home.
World leaders and celebrities will be among 18,000 people expected to attend the funeral at the KFC Yum! Centre, with the ceremony broadcast to millions of viewers around the world.
Former US president Bill Clinton will deliver a eulogy, while Ali's widow Lonnie and two of his nine children, daughters Rasheda and Maryum, will also address the congregation.
Former world heavyweight boxing champions Lennox Lewis and Mike Tyson and Hollywood actor Will Smith, who portrayed Ali in the 2001 film about the boxer's life, are among the pallbearers.
Speaking ahead of the funeral, Lewis said it was a "privilege" and an "honour" to be involved in the ceremony.
He told the Press Association: "We're laying to rest another king - the greatest.
"He was the only one that floated like a butterfly and stung like a bee. I think he's in a better place right now."
Huge crowds gathered in sweltering temperatures as the hearse paused briefly outside the Muhammad Ali centre, where fans chanted "Ali! Ali!".
Some of Ali's family and friends in the cars following the hearse waved to people watching from the roadside.
The coffin passed Ali's childhood home and travelled along Muhammad Ali Boulevard as part of the procession.
Fans have travelled to Louisville from around the world to honour Ali in his home city.
Murad Qureshi and his brother-in-law Adam Shabbir made the 4,000-mile trip from London to pay respects to "The Greatest".
Mr Qureshi, a former London Assembly member, told the Press Association: "I remember when my father passed away, I said the only other funeral I would want to be at would be Muhammad Ali's one.
"Very simply, he's the greatest. He's had a phenomenal influence on a lot of our lives - not just in the sporting arena as the world heavyweight champion three times, but also as a civil rights campaigner and a conscientious objector."
US president Barack Obama, who will miss the funeral to attend his daughter Malia's high school graduation ceremony, described Ali as "an icon" and a "personal hero" who transformed "not just the world of sport, but the world as a whole".
In a video message, he said: "It's very rare when a figure captures the imagination of the entire world. It's even rarer when that figure does so by being open and funny and generous and courageous.
"He was one of a kind. In my book, he'll always be the greatest."
Mr Obama and his wife Michelle are sending a letter to be read at the service, where White House senior adviser Valerie Jarrett - who knew Ali personally - will represent the president.
American actor Billy Crystal and Malcolm X's daughter Attallah Shabazz will speak at the funeral, while King Abdullah II of Jordan is expected to be among the congregation.
It was reported Turkish president Recep Tayyip Erdogan, who has been in Louisville and was expected to attend the funeral, had cut short his visit amid claims of a rift with the ceremony's organisers.
Mr Erdogan was initially due to address the funeral but was later removed from the list of speakers after other names were added.
The pallbearers include Jerry Ellis - the brother of Jimmy Ellis, Ali's former sparring partner and fellow world heavyweight champion - and Ali's cousins John Grady and Jan Wadell, nephew Ibn Ali, former brother-in-law Komawi Ali and family friend John Ramsey.
The funeral will be live-streamed on the internet and is also being shown at London's 02 Arena, the site of his I Am The Greatest Exhibition.
Some ticket-holders for the funeral have been criticised for trying to profit from the free event by selling tickets online.
Ali family spokesman Bob Gunnell said he was "personally disgusted" at attempts to profit from Ali's funeral and urged people not to buy the tickets.
A traditional Islamic prayer service was held for Ali on Thursday at Freedom Hall, where Ali made his professional debut with victory over Tunney Hunsaker in 1960.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules here