FALFURRIAS, Texas (AP) Officers have rescued three dozen smuggled immigrants who were crowded into a refrigerated truck trailer in South Texas.

The Border Patrol on Tuesday announced the rescue of the immigrants during a search at the Falfurrias (fal-FYOO'-ree-uhs) checkpoint.

The rig underwent a secondary examination Sunday morning after a law-enforcement dog alerted agents to a possible issue with the trailer.

Border Patrol agents opened the trailer and found the immigrants, who were shivering due to the low temperature. All declined medical attention.

The driver faces prosecution.

The Border Patrol didn't immediately provide additional details Tuesday.