February 23, 2011

As night falls, U.S border patrol agents know smugglers will use the dark to sneak into the country with illegal immigrants and drugs — both above and below ground.

Under the Arizona border city of Nogales is a network of tunnels — some built as part of the city’s flood defenses, others built by the smugglers.

U.S. Border Patrol agent Michael Camdron says: “We’re usually trying to see some sign that someone’s been coming through, pushing bundles of marijuana or something like that.”

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