(CNN) — Eighty-four undocumented migrants have been rescued from a semi-truck in southern Texas, according to a tweet from Hidalgo County Sheriff Eddie Guerra.

A concerned citizen called in to report a semi-truck at a residence in Weslaco, Texas, according to Guerra. Weslaco is located about eight miles north of the US border with Mexico.

The migrants are from Central America, Guerra told CNN on Thursday, and none of the migrants at the scene asked for medical assistance when found.

Deputies with Hidalgo County Sheriff’s Office responded to the scene along with US Customs and Border Protection, Guerra said. An investigation is ongoing, and Special Agents with ICE Homeland Security Investigations are looking into the incident as a human smuggling case, the sheriff said.

CNN is reaching out to CBP to learn more about the migrants and their conditions.

In June, 51 migrants including children were found dead inside a semi-truck in San Antonio. Two men are charged in that smuggling operation.

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