SARITA, Texas - U.S. Border Patrol agents found 18 undocumented immigrants inside a tractor trailer Wednesday morning.

The agents found the immigrants after a K-9 alert led to a second inspection of the trailer.

The immigrants were found in the refrigerated trailer among produce. The temperature inside the trailer was 51 degrees.

Agents said the immigrants had no way of escaping the trailer because it was locked from the outside.

The driver of the trailer, a Mexican national, was arrested at the checkpoint in Sarita.

Agents said the immigrants came from Mexico, Columbia, Honduras, El Salvador, Guatemala, and Kosovo.

They will be processed accordingly.

Several of the undocumented immigrants can be seen inside the trailer on Wednesday, May 3, 2017.