On June 27, the tractor-trailer was discovered on Quintana Road by workers from a nearby business.[1] The road runs parallel to Interstate 35, one of the major north-south routes in the central United States for traffic and commerce from the Southern border, which is often exploited by smugglers.[8] San Antonio Police Chief William McManus reported that officers had received a call shortly before 6pm after a passerby had heard a cry for help.