EL PASO (AP) — The U.S. Border Patrol says a road construction crew has uncovered an abandoned tunnel in Texas, just north of the border with Mexico.

Agent Oscar Cervantes says the tunnel was discovered Thursday near downtown El Paso.

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(credit: U.S. Customs and Border Protection)

The Border Patrol said in a statement that the Texas Department of Transportation reached out after a cave-in during construction of a road. The mishap led to the discovery of the tunnel that originates north of the international border. Authorities don’t know the purpose of the tunnel or where it goes.

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Border Patrol confined-space resource teams are examining the area to determine the extent of the tunnel, apparently reinforced with wooden beams.

Cervantes declined to release further details Friday, citing the ongoing investigation.

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