The loads of dirt coming out of the boarded-up hut perplexed Canadian border guards. So did the loads of construction materials going in. Acting on a hunch that the activity wasn't legitimate, the guards tipped off investigators, who found that the hut was a starting point for an elaborate, 360-foot drug-smuggling tunnel beneath the U.S.-Canadian border.
On Thursday, authorities said they have shut down the tunnel — the first such passageway discovered along the nation's northern edge — and arrested five people on marijuana trafficking charges.
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