Sony has hired investigators after a breach of security, in which the personal data of more than 100 million online game users was compromised.
Cyber-security detectives from Guidance Software and Data Forte, among others, have been brought on board, said Sony.
The Playstation Network and Sony Online Entertainment have been taken offline.
Information including names, addresses and potentially even credit card numbers was stolen in the attack.
Officials from the US Federal Bureau of Investigation (FBI) said they were looking into the breach of data, which might include some credit card numbers.
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