More info here: <a href="http://whatsinbrazil.tumblr.com/post/52916097951/its-not-about-the-bus-prices" rel="nofollow">http://whatsinbrazil.tumblr.com/post/52916097951/its-not-abo...</a>
I like how in one of the videos floating around, the police (or militia) fire off their first tear gas round just as the narrators, and others in his pack, shout "Sem Violência!"