Up to half a million foreign visitors are descending on Rio for the Olympics, despite concerns over crime, pollution, the Zika virus and the threat of terrorism.
They are being protected by 85,000 police and soldiers, more than double the number of security personnel at the 2012 Games in London.
"So far we are really impressed with the security that's around," said one young woman, wearing a 'Canada' baseball cap.
"There is quite a bit of military presence but it makes you feel more comfortab…
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