By Lara Holmes

Hacking network Anonymous has released a recording of a conference call between the FBI and UK police in which they discuss efforts against hacking.

The call, said to have taken place last month, covers the tracking of Anonymous and similar groups, dates of planned arrests and details of evidence held.

 

Anonymous also published an email, apparently from the FBI, showing the email addresses of call participants.

 

The FBI confirmed the intercept and said it was hunting those responsible.

London's Metropolitan Police's central e-crime unit said the matter was being investigated but that no operational risks had been identified.

It was unclear how Anonymous had managed to obtain the recording but a lawyer for one of the suspects discussed said it appeared to have been taken as an audio file from an intercepted email, rather than having been eavesdropped on.

BBC security correspondent Frank Gardner says the recording, which was published on YouTube, will be highly embarrassing for the cyber crime detectives.

Also on Friday, hackers operating under the Anonymous name took over the website of Greece's justice ministry, prompting officials to take the site down.

The hackers said the action was a protest against Greece's signing of a global copyright treaty and the government's handling of the economic crisis.

The website was replaced with a video of a figure wearing the symbolic white mask of Anonymous supporters, saying: Democracy was given birth in your country but you have killed it.