Factbox - Brazil's history of violent prison uprisings

About 60 people were killed in a prison riot in the city of Manaus sparked by a war between rival drug gangs, officials said on Monday, in some of the worst violence in years in Brazil's overcrowded penitentiary system. Violent uprisings among Brazil's 600,000-strong prison population are a regular occurrence, fed by chronic overcrowding, degrading conditions and competition between criminal groups that control large swaths of penitentiaries. Following is a list of notable riots: October 2016 -