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Apple said Tuesday that the leak of a number of private - and some naked - photos of celebrities was "a very targeted attack on user names, passwords and security questions." But the company said the theft didn't involve an actual breach of the iCloud storage system itself, as some reports have suggested.

"After more than 40 hours of investigation, we have discovered that certain celebrity accounts were compromised by a very targeted attack on user names, passwords and security questions, a practice that has become all too common on the Internet," Apple said in a statement. "None of the cases we have investigated has resulted from any breach in any of Apple's systems including iCloud or Find my iPhone.We are continuing to work with law enforcement to help identify the criminals involved."

The online hack resulted in photos of several celebrities, including actress Jennifer Lawrence and model Kate Upton, posted to the Internet.

iCloud exposure

Sep. 2, 201402:33

IN-DEPTH

--- Keith Wagstaff