Drug cartel battle kills 52 in northeastern Mexican prison

A battle between the feared Zetas drug cartel and rivals at a prison left 52 people dead in the northeastern Mexican city of Monterrey, authorities said on Thursday, days ahead of a planned visit by Pope Francis to another jail in Mexico's far north.

The incident was one of the worst in a series of deadly riots in recent years to rock the country’s overpopulated prisons, some of which are largely controlled by cartels.

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