The Defence Secretary has confirmed that two British soldiers have been shot dead by an Afghan National Army gunman.
Philip Hammond has told the Commons the incident happened at the entrance gate to the British HQ in Lashkar Gah.
NATO has confirmed that the gunman was then shot dead by return of fire.
A total of 407 British troops have been killed in Afghanistan since military operations began in 2001.
In a statement to the Commons, Mr Hammond stated: “Our thoughts, as ever, are with their families, for whom this will be a deeply personal tragedy”.
Details of the incident are still emerging and relatives are being informed.