The founder, Kim Dotcom, and six others employed by the site were charged with eight additional counts of copyright infringement and wire fraud. They were originally charged with five counts of conspiracy and copyright infringement.

Dotcom and four of his co-workers have been arrested and are awaiting extradition proceedings in New Zealand and the Netherlands. Two suspects remain at large.

They have been charged in a federal court in Virginia with a making millions of dollars from peddling copyrighted materials, including popular television shows, movies and music to millions of users around the world.

A lawyer for Megaupload was not immediately available for comment. Previously a lawyer for the company said the site served merely as a place for users to store data online and the company has said previously it took down content upon request.

The superseding indictment said the Megaupload site had 66.6 million registered users as of January 2012 and just under 10 percent had ever uploaded a single file, suggesting most people used the site only to download infringed material, according to the Justice Department.

The indictment also accused the group of taking copyrighted material from sites such as Google's YouTube video service for use on Megaupload websites. The Megaupload service has been shut down.

The case is USA v. Kim Dotcom et al, No. 12-cr-3, in U.S. District Court for the Eastern District of Virginia.

(Reporting By Jeremy Pelofsky; editing by Andre Grenon)

• A Permanent Economic Emergency