Two British peacekeeping soldiers serving in Afghanistan have died of gunshot wounds sustained in a "non-hostile" situation at Kabul airport, the local British command has said.
The two men, who have yet to be identified, were part of the International Security Assistance Force (Isaf).
Their commander said that no other person was thought to have been involved in the incident.
"It's with deep regret that I have to inform you of a tragic event that happened last night at the airport," Colonel Simon Levey told a press conference.
"Two British soldiers died."
He said the military police are conducting a full investigation, but that enemy fire was not believed to have been involved.
"What I can tell you is that both soldiers died from gunshot wounds, and we believe that no other person, or groups were involved," Colonel Levy said.
The soldiers have not yet been named publicly because their families have still to be notified of their deaths.
The two soldiers were killed at the military dispatch point at Kabul airport, which is one of the places where British troops are deployed.
Tense situation
The BBC's Kylie Morris in Kabul says that although morale in Isaf is generally high, there are daily reminders of how tenuous the situation really is.
In the past three days there have been three separate small explosions in the capital.
Another British soldier serving with Isaf was killed earlier this year in a shooting accident.
Around 400 British troops are based in Kabul as part of the 20-nation Isaf contingent.
British paratroopers came under fire in Kabul twice in one week in February.
Although there were no injuries - it was thought to have been armed thieves who were disturbed by the troops - defence experts warned the situation could spiral out of control.
Britain handed over control of Isaf to Turkey at the end of the Afghan grand assembly - the Loya Jirga - in June.
Isaf's role is limited to security duties in Kabul.
Most of the British troops engaged in Afghanistan - including 1,700 Royal Marines - returned home in June.
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