Hackers claim credit for Visa attack.
The Anonymous hacker group says it took the Visa website down on Wednesday in retaliation for the credit card company suspending payments to the Wikileaks site, with Facebook and Twitter removing the group's accounts.
The group hit the MasterCard site with a distributed denial-of-service attack for the same reason, and it took down PayPal over the weekend. The MasterCard site was back up this afternoon. Visa said on Tuesday that it was suspending payments to the controversial whistleblower site, joining MasterCard and PayPal.
Read: Analysis: Is Wikileaks' Assange actually a terrorist?
For more on this story, read Facebook, Twitter boot WikiLeaks supporters after Visa attack on CNET News.