Muhammad Ali has died aged 74, a family spokesperson has confirmed.

The one-time world heavyweight boxing champ - probably the most famous sportsperson the world has ever known - passed away at a hospital in Phoenix, Arizona, after being admitted on Thursday. He had been suffering from a respiratory problem, an illness complicated by his Parkinson's disease, and was on life support for the past 24 hours. The sad news has produced an enormous outpouring of reaction and tributes from leading figures across all fields. His former opponent George Foreman led the way: https://twitter.com/GeorgeForeman/status/738952710364352512 https://twitter.com/GeorgeForeman/status/738976875440021504 https://twitter.com/GeorgeForeman/status/738985710137409537 https://twitter.com/MikeTyson/status/738957087477227521 https://twitter.com/JarrydHayne/status/738957121782321157 https://twitter.com/CathyFreeman/status/738957047157293056 https://twitter.com/OscarDeLaHoya/status/738964013812469760 https://twitter.com/ShaunKing/status/738809830521982976 Muhammad Ali, born Cassius Clay, born 17 January 1942; died 3 June 2016