Hacking network Anonymous has released a recording of a conference call between the FBI and UK police in which they discuss efforts against hackers.
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 and Scotland Yard confirmed the leak and said they were investigating.
It also emerged on Friday that hackers linked to Anonymous had accessed the websites of several US law enforcement agencies and that of the Greek justice ministry.
Read more here