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A sign is shown at the Facebook campus in Menlo Park, Calif., Friday, May 11, 2012. (AP Photo/Jeff Chiu)

Facebook won't say who's behind security breach


NEW YORK (AP) — Facebook says the FBI is investigating a major security breach of its service, but the company says authorities asked it not to discuss who may be behind the attack.

That suggests Facebook may know or suspect who's behind the breach. When Facebook disclosed the breach two weeks ago, company officials said they didn't know who was behind the attacks or where they might be based.

Facebook is disclosing for the first time that hackers accessed data from 29 million accounts as part of the breach. The exact number hadn't been known before. Originally Facebook said 50 million accounts could have been affected, but Facebook didn't know if they had been misused.

Facebook says third-party apps and Facebook apps like WhatsApp and Instagram are unaffected.

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