Two West soldiers have been shot dead in Afghanistan by a man wearing local police uniform.
The Ministry of Defence said the men, from the Warminster-based 3rd Battalion The Yorkshire Regiment, were killed at a checkpoint in Helmand province.
Major Laurence Roche, of Task Force Helmand, said: "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."
An MoD spokeswoman said: "It is with sadness that the Ministry of Defence must announce the death of two soldiers from 3rd Battalion The Yorkshire Regiment on Saturday.
"The soldiers 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 district, Helmand province."
Their families have been informed.
The MoD said the deaths were unrelated to the attack at Camp Bastion in which two US Marines were killed.
It brings the number of members of UK forces to have died since operations in Afghanistan began in October 2001 to 430.