Prison riots in Brazil have killed two inmates.

The deaths were reported Sunday at the Viana prison in the state of Espirito Santo.

Reports say inmates there and in Sao Paulo state are holding hostages including guards and prisoners' family members who were visiting when the outbreaks began.

Authorities said there have been at least eight uprisings since Wednesday.

Last month, the First Capital Command gang instigated a series of prison riots in Sao Paulo. In addition to the May inmate rebellions, the gang launched a series of attacks against police officers. At least 170 people were killed, including police officers, civilians and prison inmates.