Defence Secretary Philip Hammond says an investigation into the deaths of three soldiers in Afghanistan is underway.
In a statement, he said: "We are determined to get to the bottom of exactly what happened yesterday at Checkpoint Kamparak Pul, and to pursue those who are responsible.”
I was saddened to hear of this cowardly act by a man wearing an Afghan uniform, which has taken the lives of three brave British soldiers. All of our thoughts are with the families of these men who have died in such tragic circumstances. They gave their lives protecting Britain’s national security, helping to make sure that Afghanistan never again becomes a haven for international terrorism.
He added that although yesterday's incident was 'deeply tragic', it would not 'derail the mission or distract us from the task in hand'.
The bodies of Welsh soldiers Craig Roderick and Leonard Thomas, who were killed in Afghanistan, will return to the UK today.
The family of Welsh Guard, Craig Roderick, who was killed in Afghanistan this weekend say he has left a void which will 'never be filled.'
The MoD has confirmed that two Welsh soldiers have been killed in Afghanistan. Craig Roderick and Leonard Thomas were from Cardiff.