I just came across through Yahoo.......

The websites of Visa and Mastercard were sabotaged Wednesday in what is believed to have been an act of retribution by supporters of WikiLeaks against companies that have cut off the whistleblower site.

The U.S. site of Visa was still inaccessible as of late Wednesday afternoon. but both the U.S. and Canadian sites of MasterCard were back up after being down most of the day, the victims of a cyberattack dubbed Operation Payback.

Visa and MasterCard suspended WikiLeaks's accounts with them on Tuesday, effectively cutting off donations to the site made using those credit cards. Internet payment company PayPal has also shut down WikiLeaks's account, as has Amazon's web hosting arm, whose servers WikiLeaks had been using, and the DNS provider EveryDNS.

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http://ca.news.yahoo.com/visa-mastercard-targeted-wikileaks-allies.html