The DoJ announced on Thursday that it had taken action to force Megaupload and related domain names offline, and had charged the firm's co-founders and others with violating piracy laws.
Hours later a statement linked to the @AnonymousWiki twitter account announced: "We Anonymous are launching our largest attack ever on government and music industry sites. Lulz. The FBI didn't think they would get away with this did they? They should have expected us."