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Federal authorities have uncovered yet another cross-border tunnel during a sweep in Nogales, Mexico - thwarting would-be drug smugglers. Border Patrol agents and federal police from Mexico discovered a tunnel on Thursday just west of the DeConcini Port of Entry. Newly disturbed dirt visible in a drainage ditch tipped off the agents, who traced it to a tunnel 133 feet in length, and nearly three feet high. The tunnel dig had not yet been completed - it did not open up on the U.S. side.

View of a drug smuggling tunnel discovered by federal agents in Nogales, ArizonaU.S. Customs and Border Protection / U.S. Customs and Border Protection

The use of tunnels by drug smuggling organizations in the southern Arizona border region continues to be a popular tactic, but one that federal agents have repeatedly stymied.