http://orange20bikes.com/2010/09/you-think-youve-got-it-bad/
During Brazilian version of Critical Mass, known as Bicicletada, September 27, in Curitiba (south Brazil), about 20 cyclers were threatened with heavy weapons and forced to abandon group pedalling. …Activists destroyed illegal excessive electoral campaign posters that polluted urban esthetics. Several police vehicles started to follow the cyclers who were stopped by exaggerated action. [This] was just at the moment when activists obstructed a car in order to help an elderly man to cross a street at the administrative city destrict. Militaries needlessly pulled out weapons (picture) against the cyclers putting people lives in danger. No one was arrested.