Authorities and celebrities are grappling with how to respond to a website that has posted what appears to be private financial information about top government officials and stars such as Jay-Z and Mel Gibson.

The Justice Department said on Monday that the FBI was investigating how the Social Security number, address and a credit report of FBI Director Robert Mueller ended up on the site. The site also posted the same information about Los Angeles Police Chief Charlie Beck.

In addition to Jay-Z and Gibson, other targeted stars included Beyonce, Ashton Kutcher, Kim Kardashian and Paris Hilton.

Information posted about Vice-President Joe Biden and former Secretary of State Hillary Clinton did not include credit reports but included addresses and other sensitive information.

Social Security numbers posted on Gibson, Jay-Z and others matched records in public databases.

The site, which bears an Internet suffix originally assigned to the Soviet Union, expanded throughout the day on Monday to add entries on Britney Spears, former vice-presidential candidate Sarah Palin and others.

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