PORTERVILLE, Calif. (KFSN) -- A Porterville teen is one of 28 people recently charged by the Department of Justice for his alleged connection to an online extremist group.

In a six-page indictment filed by prosecutors, Tony Long is accused of sexually exploiting a minor in Washington, cyberstalking another in Tulare County, and crushing animals. The 19-year-old has denied the charges.

Prosecutors say he is an associate of "764."

"We're going after the new form of what I refer to as modern-day terrorism in America: 764 crimes that involve harming our children by going after them online," FBI Director Kash Patel said in September.

ABC's Chief Justice Correspondent Pierre Thomas has investigated the group for months.

"It's both a national security threat and a threat to families," he to

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