Well-known hacker organization Anonymous decided to strike back after the Megaupload shutdown earlier today. The twitter account @AnonOps seems to be claiming responsibility for the attacks on several websites: 'One thing is certain: EXPECT US! #Megaupload'.

Anonymous attacked the websites for the Department of Justice, Universal Music Group, the Recording Industry Association of America, and the Motion Picture Association of America. A representative from the Department of Justice told CNN Money: "We are having website problems, but we're not sure what it's from".