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TUCSON, Ariz. – Officials with the U.S. Customs and Border Protection said agents in southern Arizona rescued 26 migrants stranded in the mountains as temperatures rose in the area.

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In a news release, the agency said Friday the rescue took place Wednesday afternoon in the Tabletop Mountains near Gila Bend. Agents were alerted after one of the migrants called 911 for help.

Temperatures in the Sonoran Desert had surpassed 95 degrees Fahrenheit.

Of the 26 migrants located, several required immediate treatment for heat-related illnesses, CBP officials said in the release. Four were flown to area hospitals with severe dehydration.

As the peak of summer approaches, heat is a major concern in Arizona, the CBP said.