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Jon took all the precautions he believed necessary and honestly sought to fully abide by all laws and regulations regarding transporting his shotgun across the border, including asking the United States Customs and Border Protection agents for the proper procedures to do so,” the lawmaker wrote in her letter. “The CBP agents informed him that he could take his shotgun into Mexico as long as he registered it with the Mexican authorities.We are extremely concerned over the role Customs and Border Protection has played in this situation.”

A State Department official said Mr. Hammar was arrested Aug. 15 in Matamoros and charged with possession of a restricted firearm, and the U.S. consulate general in Matamoros has been providing consular services to the former Marine since the office was notified of his arrest on Aug. 16.

The official also said when the State Department learned that physical restraints were being used, it raised the issue with prison authorities, who agreed to stop using the restraints.