The Brazilian authorities have deployed more than 80,000 police and soldiers to patrol Rio during the games.
Security incidents at Rio 2016
5 August - Two rowing coaches robbed at knifepoint on Ipanema beach, the Australian Olympic Committee says
6 August - Security co-ordinator for the opening ceremony targeted in attempted robbery as he left the Maracana stadium the morning after - his guards opened fire on the assailants, killing one of them
6 August - Portuguese education minister robbed in Ipanema as he was coming back from a cycling event
11 August - Russian swimmer Evgeny Korotyshkin (not a competitor) posted a photo on Instagram of two armed men who robbed him near Ipanema - the photo has since been taken down