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Police found the truck on a remote road near Lackland air base, local officials announced.
Another 16 people, 12 adults and four children, found at the same location, are receiving medical attention due to heat and dehydration, said fire chief Charles Hood.
The people in the trailer were part of an alleged attempt to smuggle migrants to the United States, Police Chief William McManu added, adding that at least three people are in police custody, although it is unclear whether they are linked to this. case.
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