Hacking collective Anonymous claims to have hit PayPal, posting 28,000 account passwords online as part of a day of action linked to Guy Fawkes Night.
The @AnonymousPress Twitter account made the claim overnight, tweeting a link to a privatepaste post.
The post has since disappeared but, according to
The Next Web, it contained what appear to have been e-mails, names, and passwords for thousands of PayPal customers.
PayPal's PR chief later tweeted the site to confirm that it is investigating the claim but has found no evidence of a hack so far.
Several Web sites, including NBC, have been hacked and defaced by the group on a day remembering Guy Fawkes, whose image is strongly associated with the movement thanks to the masks seen in V for Vendetta.
In addition to their online action, a march is understood to be planned on the Houses of Parliament in London this evening.
Update: PayPal has given the Next Web the following statement: "It appears that the exploit was not directed at PayPal after all, it was directed at a company called ZPanel. The original story that started this and was retweeted by some of the Anonymous Twitter handles has now been updated."