Anonymous and another hacking group, LulzSec, have been attacking government and law enforcement targets for a couple of months as part of a campaign they call "Antisec." Anonymous broke into an Arizona police system and released e-mails from there. It also attacked Turkish government websites. Authorities in several countries, including Spain, the U.K. and Turkey, have arrested people they say are affiliated with Anonymous.

LulzSec has disbanded following member arrests. It had attacked networks of the U.S. Central Intelligence Agency, the U.S. Senate and the U.K.'s Serious Organized Crime Agency.

The IDG News Service