Hackers from Anonymous, best-known for attacks on Scientology and Wikileaks detractors, have brought down the website of HBGary Federal, a security services firm helping the FBI to unmask its members.

Anonymous members hacked into HBGary’s website and posted an image containing a message explaining their actions.

They downloaded over 60,000 messages from the company’s email servers and posted them on The Pirate Bay.

The Twitter account of HBGary’s CEO, Aaron Barr, was also compromised and used to tweet a number of offensive messages, as well as his home address, social security number and mobile phone number.

The Financial Times recently quoted Barr as saying that he had identified two key members of Anonymous, including a co-founder in the US along with senior members in Britain, Germany, Netherlands, Italy and Australia.

Recently, Anonymous launched distributed denial of service (DDoS) attacks on Visa, PayPal and others in support of whistle-blowing site WikiLeaks.

The security firm, in collaboration with the FBI, has been working to identify members of the group responsible for DDoS attacks on companies that suspended services to Wikileaks.