The source said the flames destroyed the steering cables above the front cargo hold that control the plane's movement.

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The U.S. themselves say that a cargo truck ran out of control and plowed into at least 12 civilian vehicles.

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Executives said UPS wasn't affected by the slowdown because many of its cargo flights are at night when control towers are less hectic.

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The two-wheeled bot is equipped with a low-resolution monochrome camera that feeds images back to the Operator Control Unit, and since it weighs just a single pound and fits in most cargo pockets, the whole platoon could carry their own in order to really scope out the next bend.

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The Zetas, who are estimated to have more than ten thousand fighters, control virtually the entire east coast of Mexico, and have laid claim to several of the busiest cargo crossing points on the U.S. border, including Matamoros, Reynosa, and Nuevo Laredo.

NEWYORKER: The Kingpins