Afghanske politi eller regjeringssoldaters drap på allierte soldater er ved å bli en alvorlig belastning for forholdet, og kan umuliggjøre fortsatt samarbeid med Afghanistan. Den politiske prisen på hjemmebane kan bli for stor.
Hittil i år er 55 soldater drept i såkalt «green-on-blue» vold.
Hvorfor dreper afghanerne de som kommer for å hjelpe dem stå på egne ben?
Hele åtte – seks amerikanere og to briter – ble drept av afghanske «allierte» i helgen.
Afghaneren som drepte britene spilte såret for å få hjelp. I stedet drepte han dem.
Hvis det drepes flere av «allierte» enn av fienden er noe alvorlig galt. Man nærmere seg en slik situasjon nå.
Major Laurence Roche, spokesman for Task Force Helmand, said: “It is with deep sadness that I must report the death of two soldiers from 3rd Battalion The Yorkshire Regiment who were shot and killed by a man wearing the uniform of the Afghan Local Police at a checkpoint in the south of Nahr-e Saraj.
“The Yorkshire Regiment has suffered a deep loss today and everyone serving within Task Force Helmand will want to send our condolences to the soldiers’ families and loved ones at this time.”
NATO said the gunman was killed during the attack. He is understood to have been returning from a security operation with coalition soldiers when he turned his gun on them. He killed the two soldiers and wounded three others.
A soldier returned fire, killing the attacker.
It is the latest in a series of «green on blue» attacks by Afghan personnel on NATO troops in the country.
So far this year, 47 international service members have died at the hands of Afghan soldiers or policemen or insurgents wearing their uniforms.
The Ministry of Defence said the deaths were unrelated to the attack at Camp Bastion in which two US Marines were killed.
The deaths bring the number of members of UK forces to have died since operations in Afghanistan began in October 2001 to 430.