4th tunnel found in Ariz. near US-Mexico border

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In this undated photo provided by the United States Drug Enforcement Administration, shows the tunnel shaft entrance on the U.S. side of a 240-yard, complete and fully operational drug smuggling tunnel that ran from a small business in Arizona to an ice plant on the Mexico side of the border, Thursday, July 12, 2012, in San Luis, Ariz.(AP Photo/Drug Enforcement Administration)U.S. authorities have unearthed an unfinished border tunnel near Nogales, Ariz., making it the fourth tunnel found in a week.

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