A just-released 911 call reveals the dramatic moment when two Dallas-area teens were able to help save a woman who had allegedly been kidnapped after they saw her mouth the words "help me" from the back of a moving vehicle.

Charles Atkins Lewis, 37, was arrested Aug. 22 after allegedly kidnapping the woman, 25, who has not been identified, at gunpoint and forcing her into his car in downtown Dallas. The two teenagers noticed the woman from their car as Lewis allegedly drove her through Kaufman County, according to the recording.

"Yes, I'm on the highway. I'm witnessing a robbery. Not a robbery, a kidnapping," Aaron Arias, 19, told a 911 dispatcher. "It's me and another guy. So we're checking out the girl in the backseat because we're like, 'OK, she's kind of attractive', and then all of a sudden the guy is turned back, looking at us.

"We looked in the backseat and the blond female in the back was saying, 'Help me,' or something, whispering it. So I'm assuming it is a kidnapping."

He and Jamal Harris, 17, drove behind the car on Highway 175 for miles, staying on the phone with the 911 operator as police raced to find them.

"Oh, my God, I'm hoping the car behind me is a police office. Nope, it's not," Arias said.

Within minutes, officers arrived, pulled over the vehicle and discovered the woman, who had allegedly been kidnapped.

Police arrested Lewis and he has been charged him with aggravated kidnapping. He remains in jail on $50,000 bond and it's unclear whether he has a lawyer.

The alleged victim was examined by paramedics and released.