Just sharing: Rio 2016

This image is circling around social media here in Brazil. It is about a pool for when you think a terrorist attack is going to happen. Don't know if it is fake or just a terrible taste joke, as the title says, I'm just sharing it.
The translation is:
Strike pool
August-----2016
Comment which day you think an attack(as in terrorist attack) will happen

[link to postimg.org (secure)]

Again it can be simply a bad taste joke, but it shows how much brazilians trust the "security" provided in these olympic games.