This file photo taken on March 4, 1976 shows heavyweight boxing world champion Muhammad Ali (Cassius Clay) during a press conference in Paris about his book "The Greatest" (AFP)
Reaction on Twitter and Instagram to the death of boxing legend Muhammad Ali:
"God came for his champion. So long great one."
- former world heavyweight champion @MikeTyson
"Muhammad Ali is dead at 74! A truly great champion and a wonderful guy. He will be missed by all!"
- Republican presidential hopeful @realDonaldTrump
"God bless Muhammad Ali peace and love to all his family."
- Beatles drummer Ringo Starr @ringostarrmusic
"Muhammad Ali was not just a champion in the ring - he was a champion of civil rights, and a role model for so many people"
- British Prime Minister David Cameron
"This Man. This King. This Hero. This Human! Words cannot express. He shook up the World! God Bless Him."
- pop star Madonna
"The peoples champ. My hero"
- rapper Snoop Dogg
"This is the ALI we should all remember! The fun loving man who was fully himself!! RIP CHAMP!!!"
- Canadian pop star Justin Bieber posted this message alongside a picture of a youthful Ali playing Monopoly
"A giant among men, Ali displayed a greatness in talent, courage & conviction, that most of us will EVER be able to truly comprehend. #RIPAli"
- former world heavyweight champion Lennox Lewis
"RIP @muhammedali, a legend who transcended sport and was a true champion for all. #thegreatest#MuhammadAli"
- former Mexican-American champion Oscar De La Hoya
"Today we lost the Greatest Sportsman that's ever lived #RIPMuhammadAli"
- former Irish featherweight champion Barry McGuigan
"The Greatest there will ever be .... The biggest and the best ..... Rest In Peace."
- Former England football captain David Beckham on Instagram
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