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TUCSON, Arizona — Four Mexican soldiers crossed into a remote area of Arizona and briefly held a U.S. Border Patrol agent at gunpoint before realizing where they were and returning to Mexico, U.S. authorities said.

Border Patrol spokeswoman Dove Crawford said the incident early Sunday on the Tohono O'odham Indian Reservation, about 85 miles (140 kilometers) southwest of Tucson, was in an area where the border likely was marked only with barbed wire.

She said the soldiers lowered their weapons after about four minutes when the agent convinced them who he was and where they were, then retreated into Mexico.

State Department spokesman Gonzalo Gallegos in Washington said the encounter "stemmed from a momentary misunderstanding as to the exact location of the U.S.-Mexican border."

Crawford said there have been about 40 similar incursions along the entire border this fiscal year.