Hacking group Anonymous has reportedly released confidential passwords and other log-in details for PayPal users as part of a global day of protest.
The group announced it had leaked 28,000 alleged account passwords through several Twitter accounts as part of an organised protest on Guy Fawkes Day.
The activists also said they intended to stage a "V For Vendetta" protest outside the Houses of Parliament in London from 8pm.
But PayPal has said it had yet to find any evidence of a security breach. Several of the links to the alleged passwords have since been taken down.
Several websites have been targeted, apparently by the group or by others claiming links to Anonymous.
A hacker under the alias "pyknic" has targeted the websites of NBC shows Saturday Night Live, Late Night With Jimmy Fallon and the Tonight Show With Jay Leno.
But there also appeared to be a focus on surveillance companies, with cyber attacks on firms including TrapWire and INDECT.
Internet security firm Symantec was another that was targeted, along with some Australian government websites.
And pop star Lady Gaga took to Twitter after one of her fan sites, Gaga Daily, was defaced.
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