RIO DE JANEIRO — Thirty-one inmates were slain Friday in northern Brazil, some with their hearts and intestines ripped out, during a prison killing spree led by the country’s largest gang, authorities said.

The bloodshed comes just days after 60 inmates were killed during rioting at two prisons in a neighboring state and it increases fears that violence could spread, including to the streets of major cities, as gangs vie for influence and territory both inside prisons and in slums where trafficking operations are often based.

It’s also becoming a flashpoint for the government of President Michel Temer, whose administration is already struggling with an economic crisis and mounting corruption allegations. Authorities of the state of Roraima, on the border with Venezuela, said they requested help from Brazil’s federal government more than once to deal with its prison crisis, but no support was sent.

“This is a national crisis,” said Uziel Castro, security secretary of the state where the latest massacre happened.

Castro said the slaying spree began around 2:30 a.m. Friday at the Agricultural Penitentiary of Monte Cristo in the town of Boa Vista.

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