Ailsa Beaton, Director Of Information for the Metropolitan Police said:
"We have throughout the day researched the allegation that the Anti-Terrorist Hotline had been 'hacked' and 'activists' claims that they were able to listen unrestricted to confidential communications.
"We are confident the MPS communication systems have not been breached and remain, as they always have been, secure.
"We are satisfied that any recording would have been made via the receiving handset only and not from an attack on internal systems.
"The public can remain confident in the ability to communicate in confidence and that the integrity of the Anti-Terrorist Hotline remains in place."
More top news
David Jones was responding to London's Fire Commissioner who said the term 'fireman' was outdated and should stop being used.
A report published by the Boundary Commission for England details plans to reduce the number of MPs by scrapping 50 constituencies.
Cressida Dick said that around £700m of savings have already been made.