The tractor trailer loaded with hay bales in which the immigrants were hidden. Photo courtesy of the Border Patrol

Border Patrol agents assigned to the Interstate 8 checkpoint near Pine Valley arrested 12 undocumented immigrants who were being smuggled inside hay stacks on a tractor-trailer.

The agency reported that the incident occurred Thursday afternoon when the truck stopped at the checkpoint and a Border Patrol K-9 alerted officers. When some of the bales were removed, agents found the Mexican men.

The truck driver, a 46-year-old U.S. citizen, was booked on charges of alien smuggling.

“Human smugglers have no regard for life,” said Chief Patrol Agent Aaron M. Heitke. “This tight space within the hay-stacks was not ventilated and was not designed with passenger safety in mind. I am proud of our agents. Their dedication to service and the preservation of life prevented serious harm from befalling these individuals.”

Chris Jennewein is founder and senior editor of Times of San Diego.