Violence from the prisons has spilled onto the streets of Sao Luis, the capital of Maranhao state where the prison is located. Police say imprisoned gang leaders angered by authorities attempted crackdowns inside the prison ordered their members to spark terror by setting buses ablaze and shooting up the outside of police stations.
A 6-year-old girl died this week after being severely burned during one bus attack. Gas stations in the city largely complied with a police request to halt the sale of fuel to anyone wanting to fill-up a gas canister, hoping to squeeze off gangs' ability to buy flammable liquids used to torch buses.
The violence in the penitentiary was highlighted Tuesday when a gruesome video purporting to show the decapitated bodies of three inmates was posted on the website of the Folha de S.Paulo newspaper. It said inmates recorded the images on Dec. 17.
"The grisly crimes caught on camera are part of a broader problem of uncontrolled violence in Maranhao's prisons," Maria Laura Canineu, Brazil director of the non-governmental organisation Human Rights Watch said in a statement. "The state urgently needs to investigate these crimes, restore order in the prisons, and ensure the inmates' safety."
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Pedrinhas was built to hold 1,770 inmates but has a current prison population of nearly 2,200.
The Maranhao state government said in a statement that Martins' findings were based on "untruths aimed at worsening the situation inside the state's prison system."
Requests for further comment from the offices of Gov. Roseana Sarney, the daughter of Brazil's former president and current Sen. Jose Sarney, were not returned. The Sarney family has held sway over politics in Maranhao state for decades.