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TUCSON, Ariz. (AP) -- A Mexican man charged with robbing other illegal immigrants at gunpoint has been sentenced to 21 months in prison.

Jose Domingo Valdez-Alvarez, 42, pleaded guilty in June to being an illegal immigrant in possession of a firearm, according to federal prosecutors.

Valdez-Alvarez admitted to authorities that he went to the border near the Tohono O'odham village of Vamori armed with a .38-caliber revolver last March.

He said he wore dark clothing and a mask and would wait for illegal immigrants to cross and rob them.

Authorities said Border Patrol agents arrested Valdez-Alvarez, of Sinaloa, minutes before he planned to rob another group of illegal immigrants.

He was sentenced to prison on Monday.