An American man who defected to ISIS, but left months later after being shocked by what he witnessed, now says it was the "worst decision" that he has ever made (video below).
The man, who asked to be called Mo, told NBC News on May 19 that he was attending Columbia University, but dropped out because of the promises that ISIS made in its Internet propaganda.
"I let my family down, I've let my nation down, I've let God down, and I have a lot to make up for ..." Mo stated. "I lost sight of how people could be so evil."
After dropping out of college at age 25, Mo flew to Turkey in June 2014 and then traveled into Syria where he joined an ISIS training camp.
"I did see severed heads placed on spiked poles," Mo recalled. "I just blocked it out. I tried to ignore it."
Mo also described ISIS members: "You could see madness in their eyes."
He recalled ISIS members showing off a suicide belt.
"People were gravitating towards it, touching it like it's an exhibit, and people were just in awe of it," Mo said. "They didn't allow anyone to wear it, they were just coming close to just look at it."
Mo was asked if he regretted going to the ISIS camp, and he replied, "More than anything. That's obviously the worst decision I've ever made in my life."
Mo escaped from the camp and fled to the U.S. Consulate in Turkey in fall 2014. Mo was arrested by the FBI when he returned to the U.S. where he is currently incarcerated in an unidentified location.
According to Newsweek, Mo pleaded guilty to providing material support to an extremist group and receiving training from an extremist organization, and now faces between 10 and 25 years in prison. Mo, now 27 years old, has been working with the U.S. government for the past year and a half as an informant on ISIS.
"I think I have a real message and that's the most important thing," Mo said. "The Islamic State is not bringing Islam to the world and people need to know that."
The FBI told NBC News: "Mo has provided reliable information about the identities and activities of other ISIS members," and said that Mo may get a lighter sentence because he is working with them.