Megaupload, one of the internet's largest file-sharing sites, has been shut down by officials in the US.

The site's founders have been charged with violating piracy laws.

Federal prosecutors have accused it of costing copyright holders more than $500m (320m pounds) in lost revenue. The firm says it was diligent in responding to complaints about pirated material.

The news came a day after anti-piracy law protests, but investigators said they were ordered two weeks ago.

The US Justice Department said that Megaupload's two co-founders Kim Dotcom, formerly known as Kim Schmitz, and Mathias Ortmann were arrested in Auckland, New Zealand along with two other employees of the business at the request of US officials. It added that three other defendants were still at large.

"This action is among the largest criminal copyright cases ever brought by the United States and directly targets the misuse of a public content storage and distribution site to commit and facilitate intellectual property crime," said a statement posted on its website.

Full story: BBC News