PHOENIX - Police have discovered a sophisticated drug smuggling tunnel the length of two football fields running beneath the Arizona border with Mexico, and arrested three suspects, authorities said on Thursday.

The tunnel measuring 240 yards (220 meters) linked a building in San Luis, a small town in far western Arizona, to an ice plant in the Mexican border city of San Luis Rio Colorado, the US Drug Enforcement Administration said in a news release.

The clandestine passageway descended more than 55 feet (17 meters) into the ground and measured six feet (1.8 meters) in height. It was equipped with lighting and ventilation, and was the first ever discovered in the small border city south of Yuma.

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