SAN ANTONIO (AP) — Federal officials say one person is in custody as their investigation continues into a mysterious 911 human trafficking call.

A U.S. Immigration and Customs Enforcement statement said Friday that no other information could be provided.

Federal, state and local authorities in Texas have been searching for a tanker truck days after a 911 caller in the San Antonio area reported dozens of people were trapped inside it.

The caller said Monday that there were an estimated 80 people inside the truck’s tank — typically used to haul liquids or gases that can be hazardous — and that they couldn’t breathe.

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