Sony has warned that almost 25 million extra Playstation users may have had their personal details taken in a hacker attack.
The admission comes as the company reels from a number of security breaches.
On Monday, it took the Sony Online Entertainment (SOE) service offline as part of its wider investigation.
Last week, it admitted that the personal details of 77m Playstation users may have been stolen by hackers.
'Cyber-attacks'
In a message to its customers, Sony said: "We had previously believed that SOE customer data had not been obtained in the cyber-attacks on the company."
However, it added that "on May 1 we concluded that SOE account information may have been stolen".
Sony was quoted by the Associated Press news agency as saying that the latest incident occurred on 16 and 17 April.
This was earlier than the larger Playstation user security breach.
Sony said that during the security breach, details of non-US users were compromised.
It explained that the direct debit details of almost 11,000 customers in Austria, Spain, the Netherlands and Germany were stolen, as were the credit or debit card details of some 13,000 non-US customers.
Sales of digital books are soaring in the UK, figures from the Publishers Association show.
The association said that in 2010 sales of e-books and audio book downloads in the "general titles" category, which includes novels and consumer titles, shot up from �4m to �16m.
Academic and professional books still dominated overall digital sales, which reached �180m last year.
It still remains a small proportion of total book sales, which hit �3.1bn.
However, the increased digital sales suggests devices such as Amazon's Kindle and the Sony Reader are increasingly making an impact.
Copyright review
Richard Mollet, chief executive of the Publishers Association, said: "Digital publishing is growing at an impressive rate in whichever part of the sector you choose to look.
"Now that technology is putting e-reading devices into consumers' hands, we are starting to see the rapid growth of digital sales in this area too, as consumer publishers develop digital formats to reach wider audiences."
He added the traditional print book market remains "hugely popular" and the figures suggest print and digital books will co-exist in the future.
In the US, electronic books sold more than either hardbacks or paperbacks in February.
The Publishers Association said the digital innovation taking place in the UK could be threatened if copyright laws are watered down in a government review.
Mr Mollet said: "The innovation in the digital marketplace and the strength of British publishers' export performance is only possible because of the robust and flexible copyright framework which underpins the UK creative industries."
"We have had to take the SOE service down temporarily.
"In the course of our investigation into the intrusion into our systems we have discovered an issue that warrants enough concern for us to take the service down effective immediately. We will provide an update later today (Monday)," it said.
Last week, Sony said that it did not believe SOE users had been affected by the PlayStation Network hack.
A community relations spokesperson wrote on one of Sony's support forums at the time: "We have been conducting a thorough investigation and, to the best of our knowledge, no customer personal information got out to any unauthorized person or persons.
"We are continuing that investigation and monitoring the situation carefully; should the situation change, we will - of course - promptly notify you."
Sony Online Entertainment designs and publishes online multiplayer games for the PC, PlayStation 3 and, in the case of Fortune League, Facebook.
PlayStation Network
As Sony's investigation continued, the company promised that it would get the PlayStation network up-and-running again this week.
It said users would see a phased re-introduction of gaming, movie and music download services.
PlayStation Network has been unavailable since 20 April.
Sony revealed last week that hackers may have stolen users' personal information, including e-mail addresses, passwords and dates of birth.
It warned that credit card details could also have been taken, but said that particular data was encrypted.
A huge window shaking bang here in Abbottabad Cantt. I hope its not the start of something nasty"
End QuoteSohaib Athar
"The few people online at this time of the night are saying one of the copters was not Pakistani..."
"People are saying it was not a technical fault and it was shot down. I heard it CIRCLE 3-4 times above, sounded purposeful."
US officials stated that the raid took less than 40 minutes, but Mr Athar said there was still a military presence in the area two hours later.
"And now, a plane flying over Abbottabad..."
In his Twitter biography, Sohaib Athar describes himself as: "An IT consultant taking a break from the rat-race by hiding in the mountains with his laptops."
However, his postings during and after the raid reveal a frustration that world events had caught-up with him.
"I guess Abbottabad is going to get as crowded as the Lahore that I left behind for some peace and quiet. *sigh*"
Mr Athar told the BBC's Nosheen Abbas in Pakistan that his tweets has led to a deluge of interview requests from media organisations around the world.
He also said that he was not surprised to be the only person writing about events as they happened.
"I've been tweeting for about 5, 6 years, and been tweeting about Abbottabad because no one really talks about it,
"In fact, not many people use Twitter here. Everyone uses Facebook," he said.
Revolutionary tool
In the five years since Twitter was created, it has played a growing role in the reporting of world events.
The first glimpse that many people had of the site's potential was in 2009 when a US Airways plane made an emergency landing on New York's Hudson.
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Twitter founder Biz Stone and other technology leaders talk about the power of social networking
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Ferry passenger Janis Krums tweeted a picture of the stricken aircraft, moments after it came down.
More recently, Twitter has been hailed as a catalyst in making world events happen.
Anti-government protesters in the Middle East and parts of Africa have made extensive use of the website, along with Facebook to disseminate their messages.
The 2011 Egyptian uprising, which led to the ousting of President Hosni Mubarak, has been widely referred to as the "Twitter Revolution".
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