Broken windows on an official media bus after they shattered when driving accredited journalists to the Main Transport Mall from the Deodoro venue of the Rio 2016 Olympic Games. REUTERS/Adrees Latif

2016 Rio Olympics - Opening Ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Protesters march during demonstration against the Olympic Games near the Maracana stadium. REUTERS/Ana Carolina Fernandes

2016 Rio Olympics - Opening Ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Man is arrested during protest outside Maracana stadium. REUTERS/Pedro Fonseca

Garbage floats along the shore of Guanabara Bay, ahead of the Rio 2016 Olympic Games in Rio de Janeiro, Brazil July 29, 2016. REUTERS/Kai Pfaffenbach

Police discovered a second bullet inside the Olympic equestrian center close to the stable area, a security source said on Wednesday, the second time a stray shot has been picked up at the venue over the past week. REUTERS/Tony Gentile

Rio Olympics - Opening ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Empty seats are seen before the opening ceremony. REUTERS/Issei Kato

A protester stands behind a banner at a demonstration against the Olympic Games near the Maracana stadium ahead of the opening ceremony for the Rio 2016 Olympic Games in Rio de Janeiro, August 5, 2016. REUTERS/Sergio Moraes

2016 Rio Olympics - Diving - Maria Lenk Aquatics Centre - Rio de Janeiro, Brazil - 09/08/2016. General view of the Olympic diving pool (L) and the pool for the waterpolo and synchronized swimming (R) this afternoon. REUTERS/Antonio Bronic