The participation of 23 athletes in the Rio Olympics could be under threat, after doping samples gathered from London 2012 tested positive for banned substances.
The Kremlin has dismissed allegations of doping at the Sochi 2014 Olympics Games as "defamation by a defector."
With the 2016 Olympic Torch Relay beginning its journey through Brazil on Tuesday, take a look at some of the famous names who have carried the torch over the years.
Take a look at some of the biggest Olympic scandals of all time.
The history of the Winter Olympics is filled with names you'll likely remember. But what are those medal winners from games gone by up to these days? Click on to find out where some of your favorite Winter Olympians are today.
With the all-time mark for Winter Olympic medals falling at the Sochi Games on Wednesday, take a look at which athletes rank among the most winningest Olympic athletes of all time.
The U.S. is still looking for a gold medal in these 12 Olympic sports.
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