Visa site down, WikiLeaks supporters' next target

NEW YORK: Visa's website now appears inaccessible following a large-scale attack on MasterCard earlier in the day.

Supporters of WikiLeaks in a loosely tied Internet group called "Operation Payback" are claiming responsibility on their Twitter feed and elsewhere.

As of Wednesday afternoon, MasterCard Inc.'s site was back up. Both companies stopped processing donations to WikiLeaks on Tuesday.

Visa had no immediate comment.