Border Patrol agents from the Douglas Station say they have discovered a collapsed and abandoned cross-border tunnel.
They say a city employee reported a suspicious opening near the Raul Hector Castro Port of Entry on Wednesday morning.
Agents responded and confirmed the tunnel once extended about 60 yards into Arizona.
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The tunnel is adjacent to a sewer line and had cut through a previously found and destroyed tunnel.
Border agents say the newly discovered tunnel showed no signs of recent use and was collapsed about 25 feet from its opening.
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Authorities say criminal organizations use a wide range of techniques to smuggle both humans and narcotics into the U.S., including tunnels.
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