The dispersed Internet-based group had already claimed it had nothing to do with the attack.

In a posting on a website titled "For Once We Didn't Do It," the group said its core had not targeted Sony or the PlayStation Network. But the denial left open the possibility that individuals from the group might have been responsible.

"While it could be the case that other Anons have acted by themselves AnonOps was not related to this incident and takes no responsibility for it," the statement said.

Hotz, the hacker targeted by Sony, also denied any link with the attack.

"I'm not crazy, and would prefer to not have the FBI knocking on my door," he wrote in a blog post. "Running homebrew and exploring security on your devices is cool, hacking into someone else's server and stealing databases of user info is not cool."