A man from Mexico in U.S. Immigration and Customs Enforcement custody died last week at a hospital in Arizona, the federal agency said .

He had been detained at the Central Arizona Correctional Complex, in the town of Florence, and was pronounced dead by a doctor at the Mountain Vista Medical Center, near Phoenix, on the morning of Aug. 31, according to ICE. The agency said his cause of death was unknown and remained under investigation.

Lorenzo Antonio Batrez Vargas, 32, was a citizen of Mexico who had been arrested by Flagstaff police on Aug. 2 and charged with possession and use of drug paraphernalia, which is a felony. Immigration enforcement agents said they took Vargas into custody in Phoenix before transferring him to the detention center in Florence.

Vargas had been arrested a

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