The agents apprehended the truck on I-35, north of Laredo Sector’s immigration checkpoint Sunday afternoon, CBP said in a statement.
The agents initiated a vehicle stop and found 27 illegal immigrants in the unventilated cargo area of the U-Haul truck. The temperature inside was a blistering 106-degrees Fahrenheit.
All of the immigrants as well as the driver and passenger – both of whom are U.S. citizens – were taken into custody, pending further investigation.
"Though human smugglers may try different ways to attempt to avoid detection, our agents remain vigilant and committed to our border security and national security mission", Chief Patrol Agent Matthew Hudak said.
Fox News has reached out to CBP seeking more information on the status of the driver and the immigrants and will update accordingly.