Scotland Yard has launched an investigation into claims that calls Teampoison hackers illegally recorded phone conversations between anti-terrorism officers.
"We are aware of an issue whereby telephone conversations relating to the Anti-Terrorist Hotline have been recorded," a Scotland yard spokesman said.
"Officers are currently looking into the matter and appropriate action will be taken."
Teampoison told Sky News that they used Skype and a number of proxy servers during the attack.
"It took no skill whatsoever, it was pretty much an in-and-out job, it was pretty much simple. They use an old phone system," a member of the group said.
"If we wanted to go ahead and listen to their calls it would be easy for us. we could pretty much do it at any time and any place."
In the recording conversation posted on YouTube, two people are heard discussing One person said that the hotline received more than 700 calls from the group. "We have been subjected to a barrage of calls from a group called Teampoison. We have had about 700 calls over the last couple of nights. One of the conversations I had last night was leaked on YouTube.
"Everyone else calling was effectively shut out and could not through at all."