mojeNovosti.com
No credit card information was compromised in the attack, which hacking group NullCrew claimed in tweets to have perpetrated.
Sony does not yet know the source of the attack, company spokesman George Boyd said in Tokyo.
Sony's own servers were not accessed, but information on its customers is sometimes held at outside companies it hires to conduct sales promotions and other events, an industry source told Reuters on condition he was not identified.
(Reporting by Tim Kelly; Editing by Michael Watson)
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