A report in The Financial Times has claimed that "two veterans" of hacker group Anonymous have admitted that some of its members were likely behind the PSN outage.
It is said that "an individual or handful of supporters" took it upon themselves to further Anonymous' 'OpSony' campaign by hacking into servers and stealing information.
This echoes claims made by Sony itself last week.
“The hacker that did this was supporting OpSony’s movements,” a supposed Anonymous activist told the paper.
“If you say you are Anonymous, and do something as Anonymous, then Anonymous did it. Just because the rest of Anonymous might not agree with it, doesn’t mean Anonymous didn’t do it.”
However, Anonymous itself has once again moved to dismiss the claims in a press release, specifically attacking the story published in the FT.
"Once again Anonymous has been blamed for a security breach, this time by the journalist Joseph Menn," it reads. "His information, however, was incorrect.
"This poor piece of journalism has already been extensively referenced in the Sony matter and is being used by many people who oppose Anonymous as proof of guilt."
It also warned that Sony's actions are likely to be attracting the attentions of a far wider group of online activists.
"Outraged about the blatant coverup and shameful misdeeds, other internet hacker groups will apparently proceed with attacks over Sony’s mishandling of the matter," it continued. "These reactions prove that requesting legislation to cover up corporate crimes and the abuse of law is frowned upon by all online communities, not just the Legion of Anonymous.
"Apparently Sony will have to learn the hard way that corporate malfeasance will not go unpunished. When the dust settles Sony may have more to fear from a massive class action lawsuit by their user base than the brief actions of the Global Hacker Nerd Brigade, Anonymous… Let THE GAMEs begin."