BEXAR COUNTY, TX. (THECOUNT) — At least 42 migrants were found dead Monday in a semi-tractor in Bexar County, Texas.

According to Texas Gov. Greg Abbott, the 18-wheeler was being used to transport migrants near San Antonio.

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The grim discovery was made late Monday afternoon in an undeveloped area of southwest part of the city near railroad tracks.

The heat will likely be a focus for those investigating the deaths. Temperatures climbed to 101 on Monday, according to the National Weather Service, reports NBCNEWS.

The heat inside a trailer packed with humans was likely significantly greater than the high temperature might indicate.

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Geo quick facts: Bexar County is a county of the U.S. state of Texas. As of the 2010 census, the population was 1,714,773, and a 2018 estimate put the population at 1,986,049. It is the 16th-most populous county in the nation and the fourth-most populated in Texas – Wikipedia.