A prison riot in the Cadereyta penitentiary left two inmates killed and 13 injured
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.
About 50 inmates attacked the prison's pharmacy and set fire to cells
On Friday, three inmates died in a prison riot in the neighbouring state of Tamaulipas after a jailbreak.
In February 2016, 49 people were killed in a massive gang fight in the Topo Chico prison in Monterrey.
The prison brawl happened between rival drug gangs, days ahead of a planned visit by Pope Francis to another jail in Mexico's far north.
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Relatives of the inmates waited for news of their loved ones after the riot broke out
Prison director, Gregoria Salazar, told relatives that there was fighting in two areas of the prison and that inmates had burnt mattresses and a food-storage area. She said the death toll was still being investigated.
The incident was one of the worst in a series of deadly riots in recent years to rock the country's overpopulated prisons, which often house inmates from different drug cartels.