(Updated 3:33 p.m. PST)
Hackers have apparently gained access to private info -- nude photos and videos included -- of 50 celebrities, all of them female.
According to TMZ, victims include Vanessa Hudgens, Scarlett Johansson, Jessica Alba, Christina Aguilera, Ali Larter and Demi Lovato.
According to the site, the FBI has identified the ringleader of the hacker group, which was rumored to target politicians and sports figures. They apparently have active email addresses of 100 victims.
An FBI spokesperson would neither confirm nor deny the reports and TMZ creator Harvey Levin would not reveal how the site first learned about the ring.
Levin told TheWrap that the size and scope of the attack should leave celebrities worried about future cyber crimes.
"I think there is cause for concern. We are seeing this amazing ability to breach what everybody thought were secure devices," Levin told TheWrap. "They're not doing it for money, they're doing it for the thrill."
In the case of Hudgens, hackers may have obtained the compromising pictures and videos from someone that knows her. The actress reportedly sat down with FBI officials on Thursday.
Spokespeople for the celebrities mentioned in reports did not immediately respond to calls for comment.
Brent Lang contributed to this report