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At least 13 are dead after a riot broke out between rival groups at La Pila jail in Mexico's San Luis Potosi state.

Relatives of inmates at Mexico's Apodaca prison attempt to trespass the security fence following a riot inside the prison, on Feb. 19, near Monterrey, state of Nuevo Leon, Mexico.

JULIO CESAR AGUILAR

AFP/Getty Images

Mexico prison b 2012 05 13