The organisers of the 2016 Rio Olympics denied that vote buying helped to secure the Games after a French newspaper reported that a Brazilian businessman made payments to the son of an IOC member before the vote.
The Hungarian capital's decision leaves the battle to stage the 2024 Games between Paris and Los Angeles.
More than 266,000 sign petition against Games
Russia was stripped of their women's 4 x 400m relay silver medal after Antonina Krivoshapka tested positive for drugs in the re-testing of her sample
Alibaba, which becomes the official e-commerce and cloud services partner, joins 12 other companies.
The IOC said it took the decision after they tested positive for prohibited substances.
Romanian weightlifter Gabriel Sincraian and Russian boxer Misha Aloian have been stripped of their 2016 Olympic medals after failing doping tests at the Games, the Court of Arbitration for Sport said.
Ten more athletes, mostly weightlifters and wrestlers, have been stripped of the medals they won at the 2008 Beijing Olympics after failing doping tests in re-testing of samples.
The International Olympic Committee president calls Aspire Academy a benchmark in the world of sports
Sebastian Coe said on Friday that Qatar could move the Summer Olympics to later in the calendar year if the Gulf country ever successfully bids to host the Games.
Russia's Tatyana Lysenko has been stripped of her London 2012 Olympic gold medal in the hammer throw after the former world champion tested positive for steroids in re-tests of her sample, the International Olympic Committee confirmed.
Rome's ill-fated bid to host the 2024 Olympics was definitively buried on Thursday when the city council voted in favour of the new mayor's request to withdraw support for it.
A meeting of Paris' City Council next week will vote on a resolution formally giving Mayor Anne Hidalgo the power to sign guarantees required by the International Olympic Committee (IOC) to host the Games.