The dissident Republican paramilitary group, the Real IRA, has said it murdered construction worker, David Caldwell, in a bomb attack on a Territorial Army base in Derry on 1 August.
Mr Caldwell, who was 51, was killed when he picked up a lunch box packed with explosives.
No organisation admitted responsibility at the time.
In a phonecall to the Derry Journal newspaper this evening, accompanied by a recognised codeword, the Real IRA claimed it planted the booby-trapped device
