Brazil : 153 suspects have been arrested since Sunday , police say . The attack was triggered by the release of prisoners , security official says . The gangs have shot up a police station and torched at least five buses and 11 cars in the attacks , officials said . Two rival drug gangs collaborated to launch the attacks , he says . The attacks started simultaneously in Rio de Janeiro .
Brazil : 153 suspects have been arrested since Sunday , police say . The attack was triggered by the release of prisoners , security official says . Two rival drug gangs collaborated to launch the attacks , he says . The attacks started simultaneously in Rio de Janeiro .