Hacking network Anonymous has released what it says is a tape of a conference call between the FBI and UK police discussing efforts against hacking, BBC News reported.

The conversation discusses the tracking of Anonymous and other splinter groups, dates of planned arrests and details of evidence held by police.

Anonymous also published an email, apparently from the FBI, giving details of how to access the call and the email addresses of participants.

The FBI has not yet commented. British police at Scotland Yard said they were working on a statement.

According to the alleged email, the 17-minute phone call took place on 17 January this year. It was unclear how Anonymous had managed to obtain the recording.

In it, the police and FBI agents discuss the names of some of the people they were tracking and plans for legal action.

Usernames are included but some of the real names of people being investigated appear to have been bleeped out.

Anonymous wrote on Twitter: "The FBI might be curious how we're able to continuously read their internal comms for some time now."