USA: Mexico’s foreign ministry says 25 of the migrants found inside a sweltering tractor-trailer found parked outside a Texas Walmart were Mexican.

In a statement Monday night, the ministry says that based on interviews by Mexican consulate personnel and contact with local authorities, “we can say that of the 10 people who lost their lives ... four were of Mexican nationality.”

The statement also says that of the 29 people hospitalized, 21 are Mexican.

Also Monday, the man charged with driving the rig appeared in federal court in San Antonio.

James Matthew Bradley Jr. faces charges of illegally transporting immigrants for financial gain, resulting in death. The judge explained to Bradley that he could face the death penalty, if convicted.

In the federal complaint, Bradley told authorities he didn’t realize anyone was inside the 18-wheeler.