SAN ANTONIO (CNS) — The “completely senseless deaths” of 10 people who died of heat exhaustion and suffocation they suffered from being held in a tractor-trailer “is an incomprehensible tragedy,” said Archbishop Gustavo Garcia-Siller of San Antonio, Texas.

“There are no words to convey the sadness, despair and, yes, even anger we feel today,” he said in a statement released late July 23.

Earlier in the day, San Antonio law enforcement officials found eight bodies inside the trailer of an 18-wheeler sitting in the parking lot of a Walmart. The eight people who died were among 39 people packed in the trailer and suffering from extreme dehydration and heatstroke. At least 20 others rescued from the truck were in critical condition and transported to the hospital. Two later died, and by July 24 the death toll was at least 10.

In a July 24 statement, the chairman of the U.S. Conference of Catholic Bishops’ Committee on Migration said the nation’s Catholic bishops joined their voices in mourning the loss of life and condemning the treatment of migrants, many of whom were from Mexico and Guatemala, in a suspected human trafficking operation.

“The loss of lives is tragic and avoidable. We condemn this terrible human exploitation that occurred and continues to happen in our country,” said Bishop Joe S. Vasquez of Austin.

“In a moment such as this, we reflect upon the words of the Holy Father, Pope Francis, ‘The defense of human beings knows no barriers: We are all united wanting to ensure a dignified life for every man, woman and child who is forced to abandon his or her own land,’” Bishop Vasquez said.

San Antonio Police Chief William McManus called it “a horrific tragedy” and said it was being looked at as “a human trafficking crime.”

AP reported that James Matthew Bradley, 60, of Clearwater, Florida, believed to be the driver of the tractor-trailer, was a suspect in the case and had been arrested on charges of smuggling.

San Antonio is about 150 miles from the U.S.-Mexico border. The temperature in the Texas city July 23 was 101 degrees all day and well into late evening.

The human cargo in the tractor-trailer was discovered after someone left the truck and asked a Walmart worker for water, AP said.