NEW : 188 people have been killed or detained , military officials say . Sergio Cabral . Some Rio de Janeiro airports are closed as police focus on the main drug - dealing area . The violence involving drug gangs began with a release of prisoners , an official says . Two rival drug gangs collaborated to launch the attacks , the official says .
NEW : 188 people have been killed or detained , military officials say . Some Rio de Janeiro airports are closed as police focus on the main drug - dealing area . The violence involving drug gangs began with a release of prisoners , an official says . Two rival drug gangs collaborated to launch the attacks , the official says .