At least 15 people have been killed after violent clashes erupted in a prison in the Brazilian state of Amazonas on Sunday.
Officials said clashes broke out around 1500 GMT during visiting hours at the facility.
An investigation into the incident is currently underway, with officials adding that "there had never been deaths during the visits".
Senior officials said their speedy reaction helped reduce the fatalities.
In 2017, the prison was the scene of an inmate uprising that ended with 56 dead.

Syrian government, Kurdish-led SDF agree integration deal
Trump warns Britain on China ties as Starmer hails progress in Beijing
Israel releases 15 Palestinian bodies as truce deal shifts to next phase
WHO sees low risk of Nipah virus spreading beyond India
