ADELANTO, Calif. (AP) — Officials are investigating the death this week of a 39-year-old Mexican man who was in U.S. Immigration and Customs Enforcement custody in Southern California.

Ismael Ayala-Uribe was transferred Sunday from the Adelanto ICE Processing Center to a regional hospital for surgery on an abscess on his buttock, according to an ICE statement.

Hospital staff found him unresponsive and “initiated lifesaving measures” but he was declared dead around 2:30 a.m. Monday, the statement said. The cause of death is under investigation.

In addition to the abscess, Ayala-Uribe suffered from hypertension and tachycardia, an abnormally fast heart rate, according to ICE.

Federal records show that more than a dozen people have died in immigration detention since January, when immigra

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