(CNN) - Sarah Palin is blaming supporters of WikiLeaks for a cyber-attack that briefly brought down her her political action committee web site this week.
Beginning Tuesday, an anonymous network of hackers sympathetic to WikiLeaks launched a series of distributed denial-of-service (DDoS) attacks against against companies and political leaders critical of the whistle-blowing website, which has released thousands of previously-classified U.S. government documents.
The loose network of so-called "hacktivists" is calling itself "Operation Payback." A Twitter handle for the group took responsibility this week for attacks against Visa and Mastercard, which recently stopped accepting payments for WikiLeaks.
Palin last week accused WikiLeaks founder Julian Assange of having "blood on his hands" and called on the U.S. government to hunt him "with the same urgency we pursue al Qaeda and Taliban leaders."
SarahPAC.com was listed as an Operation Payback target and was brought down multiple times Tuesday for a period totaling 25 minutes, according to web chatter captured by the online security firm Panda Labs. The site was functioning normally as of late Wednesday.
"Governor Palin spoke out about Wikileaks because it has no regard for law or human life," SarahPAC adviser Andy Davis told CNN. "Today we learned their supporters have attacked the Palin family's personal information. Wikileaks remains a threat to every freedom-loving citizen across the globe. The world should not be intimidated. Governor Palin isn't."
The Palin adviser said Sarah and Todd Palin's personal credit card information was compromised Wednesday, but there was no immediate confirmation that the credit card problem was related to the cyberattacks.
The cyber-attack was first reported by ABC News.
The website of Sen. Joe Lieberman, I-Connecticut, was also attacked this week, Lieberman's office confirmed to CNN.
– CNN's Dugald McConnell contributed to this report