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Michael Pratt, the principal owner of the GirlsDoPorn website, is already facing criminal charges for sex trafficking involving adult women. A new indictment, unsealed Thursday, has added child pornography charges.

For years, Pratt has been recruiting young women to San Diego to shoot pornographic videos. Dozens of women say that Pratt and his colleagues lied to them and used physical coercion to induce them to participate—claims that led to federal sex trafficking charges last month.

Now prosecutors say that Pratt flew a 16-year-old girl to Southern California to have sex on camera. That would be a violation of federal laws against production of child pornography as well as sex trafficking of minors.

It's not clear if Pratt will ultimately stand trial for his alleged crimes. Pratt, a New Zealand native, reportedly left the United States in September in the midst of a long-running civil trial that is still ongoing.

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