The British serviceman who was the first to be killed patrolling so close to the perimeter of the UK's main base in southern Afghanistan is set to be named.
The airman, from 34 Squadron Royal Air Force Regiment, died in a blast near Camp Bastion in Helmand province on Thursday afternoon. His family has been informed.
A defence source said explosive devices had been planted close to the camp's perimeter before, but this was the first time a serviceman had been killed by one.
Lieutenant Colonel Nick Richardson, spokesman for Task Force Helmand, said: "The death of this courageous Royal Air Force Regiment gunner is a true loss.
"He will be mourned by his friends, colleagues and all of us serving in Helmand province.
"We know that while our loss is heartfelt, it is nothing compared to the sorrow of his family, to whom we extend our deepest sympathies."
The RAF Regiment is tasked with protecting the security of the airfield at Camp Bastion so British aircraft can safely take off and land there.
The airman was taking part in a regular patrol to prevent insurgents launching an attack on the base.
His death took the number of British troops killed in Afghanistan since the mission began eight years ago to 219.
