The deaths occurred in the Cadereyta penitentiary near the city of Monterrey after about 50 inmates attacked the prison's pharmacy and set fire to cells, the government said.
It was the second consecutive day of violence there. On Monday, two guards and five prisoners were hurt after inmates blocked corridors in the facility with burning mattresses.
On Friday, three inmates died in a prison riot in the neighboring state of Tamaulipas after a jailbreak.
(Reporting by Anahi Rama, Editing by Michael Perry)
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