A group of computer hackers known as Lulzsec on Sunday night claimed to have penetrated one of Apple's computer servers and posted a list of user names and passwords on the internet.
If the attack is genuine, it is thought to have affected a server used by Apple's business intelligence unit to collect survey data and does not affect iTunes accounts. Apple did not immediately respond to requests to comment on the incident.
The attack appears to be by the Lulzsec and Anonymous hacking groups who have been targeting a number of large companies, including Sony, which was hit by a hacking attack this year in which the personal details of 100m customers were in danger of being compromised.
A Twitter account, Anonymous IRC, used by members of Lulzsec, claimed that Apple's security had been penetrated, and posted a list of information supposedly taken from the company's servers.
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