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.
Canadian police identify suspect in mass school shooting
The suspect in a deadly school shooting in western Canada has been identified as an 18-year-old woman with mental health issues who killed her mother and stepbrother before attacking her former school.
India backs $40 billion military upgrade with more fighter jets
India on Thursday gave initial clearance for a 3.6-trillion-rupee ($40 billion) boost to the country's armed forces, including procurement of more Rafale fighter jets for the air force and Boeing P-8I reconnaissance aircraft for the navy.
Russia fully blocks WhatsApp, talks up state-backed alternative
US messenger app WhatsApp, owned by Meta Platforms, has been completely blocked in Russia for failing to comply with local law, the Kremlin said on Thursday, suggesting Russians turn to a state-backed "national messenger" instead.
Russian air attack knocks out power, heat to thousands of Ukrainians
Russia pounded Ukraine with drones and ballistic missiles overnight on Thursday, further battering its energy system and leaving tens of thousands in the capital Kyiv and the cities of Dnipro and Odesa without heat, power and water, officials said.
Bangladesh votes in landmark election after Gen Z uprising
Bangladeshis lined up outside polling booths on Thursday as voting began in a pivotal election for the country after the 2024 ouster of long‑time premier Sheikh Hasina in a Gen Z‑driven uprising.
