A group calling itself ‘the IRA’ has admitted it was behind the parcel bombs sent to major UK transport hubs.
The packages were discovered at Waterloo railway station, offices at Heathrow and London City airports, and the University of Glasgow last week.
The group has claimed there is a further device, sent to a British Army recruitment officer, which hasn’t yet been discovered.
The claims were made in a message to The Irish News, using a recognised codeword.
A spokesperson for the Metropolitan Police has said they are aware of the claims, however investigations are ongoing.
The packages found at Waterloo, Heathrow and London City had been posted with Irish stamps which prompted Gardaí to join the investigation.
They were all A4-sized white postal bags containing yellow jiffy bags.
Police Scotland carried out a controlled explosion on a suspicious package found in the mailroom at Glasgow University, after several buildings had been evacuated.
No-one was injured in any of the incidents and no arrests have yet been made.