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.
Lebanese parliament plans session to elect president
Lebanon's parliament will convene on January 9 to elect a president after a two-year vacuum, Lebanon's National News Agency (NNA) said on Thursday.
Opposition disrupts Indian parliament for fourth day
The lower house of India's parliament was suspended temporarily on Friday for a fourth day in a row this week following disruptions as opposition lawmakers sought a discussion on the allegations against Adani Group.
Russia hits Ukrainian energy facilities, causes blackouts
Russia unleashed on Thursday its second big attack on Ukraine's energy infrastructure this month, leaving much of the country without power.
Syrian and Russian jets bomb rebel-held northwest Syria
Russian and Syrian warplanes bombed rebel-held northwest Syria near the border with Turkey on Thursday to push back an offensive that captured territory for the first time in years, Syrian army and rebel sources said.
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