SAN ANTONIO (KTSA News) – A former teacher from Texas who spent three years with ISIS says he wanted to see what the group was about.

“Of course I saw the videos. I think with the beheadings, that’s execution. I’m from the United States, from Texas. They like to execute people, too, so I really don’t see any difference,” Warren Christopher Clark told NBC News in an exclusive interview.

The 34-year-old former substitute teacher from Sugarland, Texas is being held in Kurdish custody after being captured in Syria. Clark says he witnessed several acts of violence when he was with ISIS.

“I saw some people being executed publicly. I saw some crucifixions. You know, that’s just normal life there,” He said.

Clark claims he never fought for ISIS, but he admits offering to work for them as an English teacher.

“I wanted to learn more about the ideology. I’m a political science major, global business minor. I like politics. I like travel, world events,”  he told NBC News.

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