Authorities targeting extremists in the wake of the attacks in Paris may have found an unlikely ally in their battle against terrorism – the hacker group Anonymous.

Cloud storage site Dropbox has moved to deny claims it has been hacked after an anonymous account posted what it claims is the username and passwords of hundreds of the site’s users.

A sensitive conference call between FBI and British police’s cybercrime investigators was recorded by the very people they were trying to catch, officials and hackers said.

ACCOUNTS on email systems operated by Hotmail and Google have been compromised into a major industry-wide scam which could affect tens of thousands of users.