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.
Trump demands Iranian reparations as peace deal discussions continue
US President Donald Trump has responded to Iran's conditions for a peace deal on Monday with his own demands that Iran pay compensation for people killed in wars, attacks and protests as discussions on the reopening of the Strait of Hormuz continue.
Indonesia races to contain fires as haze spreads
Indonesia has stepped up efforts to contain forest and land fires across six priority provinces, deploying cloud-seeding aircraft to induce rain as authorities seek to slow the haze now spreading across the region, officials said.
At least 111 killed after powerful earthquake hits western Colombia
At least 111 people were killed after a powerful earthquake struck western Colombia early on Monday, knocking down buildings across several cities and injuring 87 more, with still others trapped in the rubble.
Russian attacks on Ukraine's Zaporizhzhia kill five, officials say
Russian attacks have killed five people and injured 20 in the southeastern Ukrainian city of Zaporizhzhia early on Tuesday while also striking Kyiv, triggering fires in the capital, officials said.
Storms from Dolphin soak China's east, ground nearly 950 Shanghai flights
Torrential rain and storms in Typhoon Dolphin's wake inundated several provinces in China's east, drenching the coastal region and flooding streets in Shanghai, where around 40 per cent of flights were grounded on Monday due to the weather.
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