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.
Thousands stranded at Japan's Narita airport after record rain kills four
Record rainfall has left thousands of travellers stranded at Tokyo's Narita airport on Friday morning as flooding in the surrounding area disrupted transport, knocked out power to homes and claimed at least four lives.
Air India A320 briefly lost key flight controls, Airbus analysis shows
An Air India Airbus dropped about 300 feet this month, injuring 24 people on board, after the aircraft registered a loss of hydraulic pressure that briefly left key flight controls unresponsive, according to a preliminary Airbus analysis reviewed by Reuters.
Philippine president says he has yet to decide who to back as successor
Philippine President Ferdinand Marcos Jr confirmed on Friday that he would endorse a candidate for the 2028 presidential election, but said he had yet to decide who he would back.
Wildfire descends on Croatian tourist town, injures 36
A wildfire in Croatia driven by strong winds descended on the tourist town of Omis overnight, engulfing houses, forcing about 1,000 people to evacuate and injuring dozens, fire brigade and health officials said on Friday.
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