The FBI says it was addressing allegations that online accounts of several celebrities, including Oscar-winner Jennifer Lawrence, had been hacked, leading to the posting of their nude photographs online.

The agency did not say what actions it was taking to investigate who was responsible for posting naked photos of Lawrence and other stars. Apple said it was looking into whether its online photo-sharing service had been hacked to obtain the intimate images.

Lawrence, a three-time Oscar nominee who won for her role in “Silver Linings Playbook,” contacted authorities after the images began appearing Sunday.

Naked images purporting to be of other female stars were also posted, although the authenticity of many couldn’t be confirmed. The source of the leak was unclear.

“This is a flagrant violation of privacy,” Lawrence’s publicist Liz Mahoney wrote in a statement. “The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence.”

The FBI said it was “aware of the allegations concerning computer intrusions and the unlawful release of material involving high profile individuals, and is addressing the matter.”

“Any further comment would be inappropriate at this time,” spokeswoman Laura Eimiller wrote in a statement.

Apple Inc. spokeswoman Natalie Kerris said the company was investigating whether any iCloud accounts had been tampered with, but she did not give any further details.

“We take user privacy very seriously and are actively investigating this report,” she said.

Actress Mary Elizabeth Winstead also confirmed that nude photos of her were posted online.

“To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves,” Winstead posted on Twitter. Winstead, who starred in “Final Destination 3″ and “Abraham Lincoln: Vampire Hunter,” wrote that she thought the images had been destroyed.

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