ABC News learned some of the information is personal, appears accurate and should not be available from publicly available websites.
LAPD Chief Charlie Beck is also on the list, which on Tuesday included Kris Jenner and Kanye West.
"We will vigorously pursue the individuals that have made me a victim and have made a number of other people that are in the public eye victims," Beck said during a news conference.
On Monday, a website posted what hackers claimed to be the social security numbers, credit card and personal banking information of several celebrities like Jay-Z, Beyonce and Mel Gibson.
"I'm very suspect of information that's released online," said former FBI profiler Brad Garrett. "It goes against the very reason you steal them; it's to use them, so is this a prank? Is it a hoax? Is it to get attention? That wouldn't surprise me one bit."
Credit reporting company Equifax confirmed some of the information is true. It says someone went through AnnualCreditReport.com, the free service anyone can use to check their credit. Equifax confirms at least four credit reports were accessed.
"Our initial investigation shows the perpetrators had the PII (Personally Identifiable Information) of the individuals whose files were accessed and were therefore able to pass the required authentication measures in place," said Tim Klein of Equifax in a statement.
Much of this involves a hodgepodge of credit report information, and officials say it is going to take some time to figure it out.
"It is a very difficult endeavor. Many of these sites are not in the boundaries of the United States. However, there is often a connection to people who live locally and in the greater United States, so we will pursue that connection," Beck said.
The site, which appears to originate in Russia, shows more than 100,000 views since Monday. Investigators are hoping they can hunt down and shut down those behind it.
