FBI arrested 16 people across the country|F.B.I. Hits the Hacking Group Anonymous

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Fourteen of the 16 people were charged in connection with an attack on the Web site of the payment service PayPal last December.

Anonymous had publicly called on its supporters to attack the sites of companies it said were turning against WikiLeaks, using tools that bombard sites with traffic and knock them offline.

A Florida man was also arrested and accused of breaching the Web site of Tampa InfraGard, an organization affiliated with the F.B.I., and then boasting of his actions on Twitter. And in New Jersey, a former contractor with AT&T was arrested on charges that he lifted files from that company’s computer systems; the information was later distributed by LulzSec, a hacker collective that stemmed from Anonymous