At least 42 inmates have been found dead at four prisons in the capital of Brazil's northern Amazonas state on Monday.
Authorities said the victims appeared to have been killed by "asphyxiation" and were discovered during routine inspections at the prison facilities.
Additional reinforcements have been dispatched to boost security, they added, without providing more details.
This comes a day after 15 prisoners were killed in gang clashes in the same city.
Israel's Netanyahu says Syria deal possible, expects buffer zone
Israeli Prime Minister Benjamin Netanyahu said on Tuesday a deal with Syria is possible and he expects Syrian authorities to establish a demilitarised buffer zone from Damascus to Mount Hermon and other areas.
Hamas says it will hand over one of two last hostage bodies in Gaza
Palestinian group Hamas said it was handing over the remains of one of the two last hostage bodies still in Gaza on Tuesday, and Israel said it was preparing to receive "findings".
Egypt calls for immediate move to Gaza peace plan phase two
Dr. Badr Abdel Ati, Egypt's Minister of Foreign Affairs and Migration, has emphasised the need to move immediately to the second phase of US President Donald Trump’s peace plan regarding Gaza, after the near completion of the first phase.
Hong Kong leader orders independent probe into fire that killed 156
Hong Kong's leader said on Tuesday a judge-led committee will investigate the cause of the city's deadliest fire in decades and review oversight of building renovations blamed for fanning an inferno that killed at least 156 people.
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