Officials in Brazil say more than 50 inmates have been killed in a prison riot in the Brazilian state of Amazonas.
The BBC reported that the unrest, which started on Sunday, ended early on Monday, police said, when the inmates surrendered their weapons and freed unharmed the last of 12 guards they had taken hostage.
A prison chaplain said the riot began after a fight between rival gangs.
A number of inmates has reportedly escaped. Brazil has the world’s fourth largest prison population.
There are some 600,000 inmates and overcrowding is a serious problem.