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.
US, Iran no closer to ending war as Tehran's response awaited
A state of relative calm prevailed around the Strait of Hormuz on Saturday, after days of sporadic flare-ups, as the United States waited for Iran's response to its latest proposals to end more than two months of fighting and begin peace talks.
Three police officers killed in Pakistan car bombing
A car bombing at a police post killed at least three officers in northwestern Pakistan on Saturday and was followed by an ambush on police personnel rushing to the scene to provide backup, security officials said.
Israeli strike kills seven in south Lebanon, health ministry says
An Israeli strike on the southern Lebanese town of Saksakiyeh killed at least seven people, including a child, and wounded 15 on Saturday, Lebanon's health ministry said.
Countries prepare to evacuate hantavirus ship passengers
Countries prepared to evacuate their citizens from the luxury cruise ship hit by a deadly strain of hantavirus that is due to anchor near Tenerife early on Sunday, as health authorities said the risk of the virus spreading was low.
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