The Tokyo 2020 Olympic and Paralympic Games have been postponed until next year because of the worldwide coronavirus pandemic.
The event, due to begin on 24 July, will now take place "no later than summer 2021".
The event will still be called Tokyo 2020, despite taking place in 2021.
The IOC had given itself a deadline of four weeks to consider delaying the Games, but there had been mounting pressure from a host of Olympic committees and athletes demanding a quicker decision.
Canada became the first major country to withdraw from both events on Sunday.
The Olympics have never been delayed in their 124-year modern history, though they were cancelled altogether in 1916, 1940 and 1944 during World War One and World War Two.
Major Cold War boycotts disrupted the Moscow and Los Angeles summer Games in 1980 and 1984.