Feds Shut Down Megaupload.com

News that one of the world's largest file-sharing sites, Megaupload.com , was shut down and several company executives indicted seemed to bring retaliation from hackers.

A loose affiliation of hackers known as "Anonymous" claimed credit attacking the Justice Department's website. Federal officials confirmed it was down Thursday evening and that the disruption was being "treated as a malicious act."

Also hacked was the site for the Motion Picture Association of America and perhaps others.

A federal indictment accuses Megaupload.com of costing copyright holders more than $500 million in lost revenue from pirated films and other content. The indictment was unsealed one day after websites including Wikipedia and Craigslist shut down in protest of two congressional proposals intended to thwart online piracy.

The Justice Department said in a statement said that Kim Dotcom, formerly known as Kim Schmitz, and three other executives were arrested in New Zealand at the request of U.S. officials. Two other defendants are at large.