A website has posted what appears to be private financial information about stars, including rapper Jay-Z and his wife Beyonce, and government officials.
Among the 11 well-known names whose financial details were released were Mel Gibson, Ashton Kutcher, Kim Kardashian and Paris Hilton.
Officials targeted included the FBI Director Robert Mueller and the Los Angeles Police Chief Charlie Beck, whose social security numbers and credit reports were published.
Pages posted on Vice President Joe Biden and the former Secretary of State Hillary Clinton did not include credit reports but included addresses and other sensitive information.
While government officials often have to disclose details on their finances – and celebrity divorces sometimes feature public financial data the information posted online exceeds those disclosures.
Social security numbers are rarely included in public records anymore because they can be used for identity theft.
Los Angeles police said they had launched an investigation into the website, which had an internet suffix originally assigned to Russia.
The site did not state how the information had been obtained or why the 11 people targeted were chosen, describing the records only as “secret files”.
Several of the purported credit reports appear to have been generated last week.
Representatives for each person targeted either declined to comment on the accuracy of the information that was posted, or they did not return messages seeking comment.
Several of the website’s pages featured unflattering pictures of the celebrities or government officials whose information was posted.
The site’s page on Beck includes a taunting reference to former officer Christopher Dorner, who was killed in a shoot-out after killing four people over several days last month.
Beck’s page included the message “(hash)YouCantCornerTheDorner” and an image of a woman protesting police corruption.