Story highlights 25 were killed in riot at same prison in October

Violence erupted Sunday at another prison, 56 prisoners killed

Rio de Janeiro (CNN) At least 33 inmates are dead following a prison riot in northern Brazil on Friday, officials said, the second prison riot in less than a week in the country.

Friday's violence took place at the Agricultural Penitentiary of Monte Cristo, in Brazil's Roraima state in the Amazon, according to Roraima state authorities. The prison is the largest in the state.

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The rioting began early Friday and military police officers entered the prison to bring the situation under control, state authorities said.

In October, 25 people were killed in another riot at the same prison.

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