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 military carries out second round of strikes on Iran
The US military said on Wednesday it launched fresh strikes on Iran to keep the Strait of Hormuz open to shipping, triggering Iranian attacks on Kuwait and Bahrain in the latest escalation to derail efforts to end the war.
Four die in Delhi building collapse as rains batter India, trigger landslides
At least four people have died in the Indian capital city of Delhi after an under-construction three-storey building collapsed following heavy rain.
Death toll from Venezuela quakes rises to 3,811 as government seeks frozen funds
The death toll from Venezuela's twin earthquakes has risen to 3,811, according to figures released by National Assembly President Jorge Rodriguez on Wednesday.
Trump to remove Syria from US terrorism sponsor list
President Donald Trump has informed his Syrian counterpart Ahmed al-Sharaa on Wednesday that he had decided to remove the country from the US list of designated state sponsors of terrorism.
Israel bars Arab League Secretary-General's visit to Palestinian territories
The Arab League has announced that Israel has barred a scheduled visit by its Secretary-General, Nabil Fahmy, to the occupied Palestinian territories.
Trump says 'a lot of unity' at NATO summit after lashing out at allies
US President Donald Trump threw a summit of NATO leaders into disarray on Wednesday as he demanded the United States cut trade ties with Spain and made renewed claims on Greenland, but later changed tack and said there had been love and "a lot of unity".
Pakistani rescuers find wreckage of lost cargo plane
Pakistani rescuers found the wreckage of a Boeing cargo plane in a deep sea search operation on Wednesday, 12 hours after it went missing off the coast of Karachi, with efforts underway to find the five crew members who were on board.
Trump says interim accord with Iran to end war is 'over'
US President Donald Trump said on Wednesday that the memorandum of understanding signed with Iran to end the conflict was "over", adding he didn't want to engage with Tehran.
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For beginners, what are the main differences between padel, tennis, and badminton?
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