Jose Hermosillo, 19, who lives in New Mexico, and his girlfriend were visiting family in Tucson when he was detained, relatives said. His case was dismissed Thursday.

A Department of Homeland Security official said Jose Hermosillo "wanted to turn himself in" and told Border Patrol he was a Mexican citizen.

U.S. citizen Jose Hermosillo was detained by immigration agents in Arizona, with conflicting accounts over his claims of citizenship.