Actress Scarlett Johansson has called in the FBI to investigate how nude photos of her were hacked from her mobile phone. The snaps of the 26-year-old actress, which were taken by her were leaked on a website yesterday.

What is worrying the FBI is that there is a phone-hacking ring thought to be responsible for stealing naked photos and videos from at least 50 female Hollywood celebrities. Other stars reportedly targeted include actresses Jessica Alba, Vanessa Hudgens, Selena Gomez and Miley Cyrus, as well as singer Christina Aguilera.

Bloggers have linked the leaks to a hacking group called Anonymous that has boasted of targeting celebrities. Mila Kunis has also been hacked and a shirtless snap of Justin Timberlake which she had on her phone was taken. One snap showed Timberlake wearing pink underwear on his head while there is another reported to be a separate explicit shot of an unidentified bloke.