State officials said inmates rioted at a psychiatric and medical block in a prison in northern Mexico, broke into a prison pharmacy and took drugs that caused the deaths of four of them.
Twenty-one more were injured, including one guard, according to a Nuevo Leon state government statement yesterday.
The complex chain of events at the prison in Cadereyta started earlier this week when inmates protested a new program to inspect visitors with a type of X-ray machine to prevent contraband being smuggled into the facility. That prompted a smaller disturbance.
But on Tuesday state security spokesman Aldo Fasci said about 56 inmates at a psychiatric block burned about 200 cells and furnishings. Some then broke into the prison pharmacy, where four of them apparently overdosed on medications stored there.
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However, it was unclear whether all four died from medications; local media reported three of the bodies were charred and thus may have died in the fires.