The three largest credit-reporting agencies - Equifax Inc., TransUnion Corp. and Experian Plc - confirmed Tuesday that hackers gained unauthorized, illegal access to reports on several famous people.

Experian is reviewing whether any of its information was compromised, and said hackers may have accessed personal data using outside information.

“Upon learning of the situation, we took immediate action to freeze the credit files of those victimized by this malicious attack in an effort to minimize impact to those individuals,” Gerry Tschopp, a spokesperson at Experian, said in a statement reported by Bloomberg News.

Statements by Equifax and TransUnion verify the authenticity of some of the documents, reported previously by Web site TMZ.com.

Equifax said credit reports on four celebrities were compromised through its service. The documents online included credit reports on U.S. Attorney General Eric Holder, Los Angeles Police Department Chief Charlie Beck, the rapper Jay-Z, former California governor Arnold Schwarzenegger and former Vice President Al Gore.

TransUnion officials said the hackers had large amounts of information about the victims, including Social Security numbers and other sensitive, personal identifying information, but did not say whose credit reports were breached.

A review of the documents online showed TransUnion credit reports on Michelle Obama, actors Mel Gibson and Ashton Kutcher, singer Beyonce and former pro wrestler Hulk Hogan.

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