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Photo by: Adriana Alvarado

Mexican army soldiers guard an entrance to the prison in the city of Piedras Negras, Mexico, Tuesday, Sept. 18, 2012. Federal police units and Mexican troops, including 70 members of an elite military special forces unit, are searching for inmates who fled the prison in this city across the border from Eagle Pass, Texas. They escaped allegedly through a tunnel 21 feet long and 4 feet in diameter on on Monday Sept. 17 and then cut their way through a chain link barrier and escaped onto a neighboring property. (AP Photo/Adriana Alvarado)

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