Federal agents have seized a ton of cocaine and seven tons of marijuana smuggled through a clandestine tunnel stretching a half mile beneath the U.S.-Mexico border, the longest one yet unearthed in California, authorities said on Wednesday.
Six people were arrested as authorities in San Diego moved on Monday and Tuesday to shut down the tunnel, the 13th underground passageway discovered along California's border with Mexico since 2006.
The 870-yard-long tunnel, one of the narrowest found in the region, also yielded an unprecedented cache of drugs.
"This is the largest cocaine seizure ever associated with . . .
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