Marcelo Crivella, the mayor of Rio de Janeiro, says 11 people died after a fire ripped through Badim Hospital.
The hijacker's intentions were unclear as he did not make any particular demands, according to police.
Brazil advanced to the final of the Copa America with a 2-0 win over old rivals Argentina in Belo Horizonte thanks to a goal in each half from Gabriel Jesus and Roberto Firmino.
Evangelicals have become an energetic voting base in Brazil, helping right-wing presidential candidate Jair Bolsonaro to become frontrunner in this year's election.
Right-wing candidate Jair Bolsonaro, who was knifed in the abdomen while campaigning on Thursday, is in serious condition, his son and a hospital spokeswoman confirmed.
Many Brazilians are demanding answers, asking how so much of the country's heritage could have meant so little that the country's National Museum could go unprotected. The building had no fire system, despite its priceless collections.
Reflecting the fear of being shot by police looking for Rio's well-armed drug gang members, the activists caution against carrying a long umbrella.
Workers rage against Temer's agenda for changing labour and pensions laws, holding nationwide demonstrations in the Latin American country.
Sprinter Kariman Abuljadayel made history by becoming the first woman to compete for Saudi Arabia in the 100m sprint event.
Following the Zika virus outbreak and the halting of construction for the 2016 Olympic Games, Brazil faces yet another dilemma in the weeks leading to the games.
Brazil's labour department halted construction at Olympic Park & Olympic Village citing the safety of workers.
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