2016 Rio Olympics - Artistic Gymnastics - Final - Men's Individual All-Around Final - Rio Olympic Arena - Rio de Janeiro, Brazil - 10/08/2016. Kohei Uchimura (JPN) of Japan (R) shakes hands with Oleg Verniaiev (UKR) of Ukraine before Verniaiev competes on the horizontal bar during the men's individual all-around final. REUTERS/Mike Blake

2016 Rio Olympics - Artistic Gymnastics - Final - Men's Individual All-Around Final - Rio Olympic Arena - Rio de Janeiro, Brazil - 10/08/2016. Kohei Uchimura (JPN) of Japan celebrates winning gold in the men's individual all-around final. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY.

2016 Rio Olympics - Equestrian - Preliminary - Dressage Individual Grand Prix Day 1 - Deodoro Olympic Equestrian Centre - Rio de Janeiro, Brazil - 10/08/2016. A security personnel member stands guard at the equestrian venue. REUTERS/Tony Gentile

A broken window on an official media bus after it shattered when driving accredited journalists to the Main Transport Mall from the Deodoro venue of the Rio 2016 Olympic Games in Rio de Janeiro. Organizers stepped up security in the area around the Olympic Park on Wednesday after a bus carrying journalists was struck by projectiles, slightly injuring two people and prompting a police investigation. REUTERS/Shannon Stapleton

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA wears an "MP" branded cap before the start of the 4 X 200m freestyle relay race. Picture taken August 9, 2016. REUTERS/Michael Dalder

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA swims with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA prepares to swim with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder

2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA prepares to swim with an inverted Speedo cap borrowed from teammate Conor Dwyer after his own "MP" cap ripped. Picture taken August 9, 2016. REUTERS/Michael Dalder