Check out these strange and unfortunate moments from the Rio Olympics

IOC executive arrested for allegedly scalping tickets.

On Wednesday, Brazilian police arrested Ireland's Patrick Hickey, a member of the International Olympic Committee's executive board, in connection with an investigation into ticket scalping. Police said they had discovered evidence linking Hickey to an international scheme to illegally pass Olympic tickets to touts who were reselling them at well above their original price.

American swimmers claim they were robbed at gunpoint. 

Gold medal winner Ryan Lochte and three of his teammates say they were robbed by thieves posing as police officers on Aug. 14. Lochte told NBC that a robber had put a gun to his forehead before taking his wallet. Brazilian police said they had found little evidence for the incident and that the swimmers were unable to provide details about what happened. Lochte is reportedly already back in the U.S., despite an order from a judge to stay in Brazil as authorities investigate the robbery claim.

Olympic television camera crashes into the crowd

Two guide cables snapped on an elevated camera, causing it to fall more than 18 metres and injure seven people on Monday. 

The injuries were "minor," and all seven people were treated and released from care later that day.

Pool water mysteriously turns green

Viewers at home and fans in the stands were miffed when the water in the diving pool turned a murky green on Aug. 9. Rio spokesman Mario Andrada said the green was caused "by a proliferation of algae."

"If it were green and yellow, we would know it was a patriotic thing," Andrada joked, referring to Brazil's national colours. Organizers said water tests were conducted and the water posed no risk to athletes, but eventually drained the pool and replaced the water.

Media bus attack leaves journalists injured.

An official media bus driving accredited journalists was attacked on Aug. 9, leaving some slightly injured by broken glass. Officials said that the bus was hit by rocks, but some reporters on board believe the bus was struck by bullets. 

A stray bullet hits the media tent.

On Aug. 6, a bullet pierced the roof of a media tent at the Olympic Equestrian Centre, missing journalists there by just a few feet. The bullet was suspected to have been fired by a gang member trying to shoot down a police blimp or drone, officials said. The incident didn't halt the competition and no one was injured.

Zika outbreak creates uncertainty 

In May, the World Health Organization rejected a call from 150 health experts to consider postponing or moving the Rio Olympics due to the Zika virus outbreak in Brazil, saying in a statement there is "no public health justification" for postponing or cancelling the 2016 games. Still, several professional golfers, tennis and basketball players cited the Zika virus among their reasons for avoiding the Games in Rio.

Rio's trash and pollution raise concerns.

Prior to the start of the Games there were also concerns over trash and pollution in Rio's Guanabara Bay and nearby sea, where sailing, windsurfing and long-distance swimming events are being held. Floating debris was particularly worrying for competitors as it could crash against boats and slow them down in the competition. Studies also showed that drug-resistant super bacteria and microbes normally found only in hospitals were in the water.

Last-minute construction headaches at the Athletes Village. 

Construction of the Athletes Village in Rio was plagued by plumbing, electrical and cleaning issues, prompting complaints from at least a dozen teams. Despite the concerns, Canadian Olympic Committee CEO Chris Overholt said in a statement that the Canadian team was "generally satisfied" with the accommodations.

Windstorm blows billboard into woman.

A billboard blew over in a windstorm in the Copacabana neighbourhood, injuring a woman on Aug. 7. Pedestrians stepped in to help. 

Security remains on high alert.

Rio's bomb squad was called in several times during the Games, including on Aug. 6 near the finish line of the men's road cycling race.