India, July 24 -- Four dark web child abuse sites were dismantled and 18 offenders were convicted in a joint operation by the Department of Justice and the FBI.

'Operation Grayskull' resulted in the dismantling of four dark web sites dedicated to images and videos containing child sexual abuse material.

The most severe punishment was delivered to a Minnesota man, Thomas Peter Katsampes, 52, who was managing the Dark Web Sites.

He was sentenced to 250 months in prison and lifetime supervised release for his involvement with one of these dark web sites. He was also ordered to pay $23,000 in restitution, the Department of Justice said.

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He pleaded guilty t...