Elizabeth Smart says she was sexually assaulted on an airplane last year

"I'm Elizabeth Smart. I should know what to do and at that moment I didn't know what to do," Smart told "NBC Nightly News" on Thursday.

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By Doha Madani and Joe Fryer

Kidnapping survivor Elizabeth Smart said Thursday that her new self-defense program was created after a man assaulted her on a plane over the summer.

Smart, who was abducted and held captive for nine months when she was 14 years old, said in an interview with "CBS This Morning" that an unidentified man molested her while she slept on a Delta flight last year to Utah.

"I had been asleep and, all of a sudden, I woke up because I felt someone’s hand rubbing in between my legs, on my inner thigh," Smart told CBS' Gayle King on Thursday.

She explained to King that she expected the man to stop and apologize, but he allegedly said nothing to her.

Smart told "NBC Nightly News" on Thursday that she was in complete shock when the alleged assault happened and felt as if she should have been better able to respond given her history.

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"I'm Elizabeth Smart," she said. "I should know what to do and at that moment I didn't know what to do."

The 32-year-old kidnapping survivor told NBC that she was initially hesitant to speak out, but felt that it was important to share what happened to her.

"What ultimately drove me to share this story in the public spotlight and put it out there is because I have met so many other women and this experience for me just really reminded me how vulnerable we all are as women, as girls," Smart told NBC News.

Delta confirmed in a statement to NBC News Thursday that Smart reached out to the company to inform them that another passenger acted inappropriately to her. The airline said it does not tolerate passenger misconduct.

"We took the matter seriously and have continued to cooperate with Ms. Smart and the appropriate authorities as the matter is investigated," Delta said.

She said that she also contacted the FBI and that there is an open investigation into the alleged assault.

The FBI told NBC News that it could not confirm or deny the existence of an investigation.

Smart was taken at knifepoint in her pajamas from her Salt Lake City bedroom in 2002 by Brian David Mitchell, who kept her captive with his wife, Wanda Barzee. Mitchell is serving a life sentence after being convicted of kidnapping and raping Smart, while Barzee was released from prison in 2018 after being convicted for her role in Smart's abduction.

The kidnapping survivor has since become an outspoken advocate against child abductions. In 2011, she founded the Elizabeth Smart Foundation, dedicated to women and girls who face abuse and sexual violence.

Smart said that she began to train in self-defense with a close friend after the attack, which helped to inspire her new self-defense program for women and girls, Smart Defense.

"It doesn't matter who you are, what you're wearing, none of those things matter if you are abused or taken advantage of," Smart told NBC News. "It's not your fault and you have every right to defend yourself, to take care of yourself. To do what you need to do to stay safe."