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IOWA CITY (AP) — Federal safety regulators have shut down a troubled Iowa trucking company that owned the semitrailer involved in a human trafficking case in which 10 immigrants died in Texas.

Pyle Transportation was placed under an "out-of-service order" Monday by the Federal Motor Carrier Safety Administration after a review found the company's safety rating was so unsatisfactory that it was unfit to remain in business, agency spokesman Duane DeBruyne confirmed to The Associated Press.

Dozens of immigrants were found packed inside a Pyle-branded semitrailer in July in the parking lot of a San Antonio Walmart. Eight people were found dead inside, and two more died after being hospitalized. The driver, James "Bear" Bradley Jr., 60, of Clearwater, Florida; and Pedro Silva-Segura, 47, of Laredo, Texas, are charged with several offenses, including conspiring to transport and harbor immigrants who are illegally in the U.S. for financial gain.

Pyle Transportation owner Brian Pyle has denied knowledge of the alleged smuggling conspiracy. He has said that he sold the trailer and hired Bradley, who had worked previously for the firm, as a contractor to drive it to Brownsville, Texas, to deliver it to the buyer.