Police officers rescued 39 undocumented immigrants from an 18-wheeler truck in Texas, indicting the man who allegedly smuggled them into the U.S. Wednesday.

A body cam on an officer's person captured the encounter where the people were pulled out of the truck and asked to sit on the floor. They looked exhausted and scared and were offered some water.

"The driver was just standing there, not a care in the world," Sgt. Jerry Reyna told ABC News affiliate KSAT in San Antonio. Reyna said the group may have been trapped for four to five hours inside the trailer.

A federal grand jury indicted Drew Christopher Potter for allegedly being involved. The 33-year-old is charged with one count of conspiracy to commit alien smuggling for money, and three counts of transportation of undocumented immigrants.

Potter admits that he was paid to just drive the truck and that's it. There is no information about who paid him to drive the truck or if he even owns it.

Potter can face up to 10 years in federal prison and a $250,000 fine if he is convicted.

"HSI is dedicated to working closely with its law enforcement partners in all arenas in pursuit of identifying, arresting and prosecuting individuals involved in human smuggling," Homeland Security Investigations Acting Special Agent in Charge Mark Dawson said.

Officers got a tip about the group of illegal immigrants on Sept. 18 when a concerned citizen called the police to report that they saw multiple people exiting the truck.

Frio County sheriff deputies and U.S. Border Patrol agents responded to the call and found the truck parked outside a convenience store. There were 28 men, seven women and four minors in the back of the truck when they arrived on scene, all from Guatemala, El Salvador and Mexico.

Check out the YouTube video of the undocumented immigrants being rescued below.

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