Hours later, suspected hitmen blew up a car outside a police station near the business hub of Monterrey.
In a brazen move underscoring Mexico's weak prison system, inmates slowly filed out of the main entrance of the jail in Nuevo Laredo early on Friday.
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Hide AdLater on Friday, in the small town of Zuazua, on the northern outskirts of Monterrey, an SUV exploded, injuring two people.