Hackers under the AntiSec banner appeared to have hacked the website of OnGuardOnline.gov, the US federal government's online security website, in protest against controversial legislation yesterday.

In a message on the OnGuardOnline website and on Pastebin, the hackers threatened "a relentless war against the corporate internet", destroying what it said would be "dozens upon dozens" of government and company websites, if the Stop Online Privacy Act (SOPA), Protect IP Act (PIPA) and Anti-Counterfeiting Trade Agreement (ACTA) are passed.

It also threatened to dump emails, passwords, bank accounts, and other information from the hacked websites. "We are sitting on hundreds of rooted servers getting ready to drop all your mysql dumps and mail spools," the Anonymous-affiliated hacker group said.

OnGuardOnline.gov is a partnership of fourteen federal agencies managed by the US Federal Trade Commission (FTC).

FTC could not be immediately reached for comment on the hack of the security website. The website of web defacement archive, Zone-H was also defaced yesterday, but it wasn't clear who was responsible.

Earlier a video purported to be from Anonymous asked for people's support to launch a DDoS (distributed denial of service) attack using the Low Orbit Ion Cannon tool on January 28 on Facebook. AnonOps, an Anonymous account on Twitter, however said the threat to shut down Facebook was a fake. A similar threat against Facebook was made last year.

Anonymous last week claimed responsibility for attacks on some government and company websites including those of Universal Music, the US Department of Justice and the Recording Industry Association of America in retaliation for the government's removal of the Megaupload online storage and file-sharing websites.