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Five British soldiers have been killed after a rogue Afghan policeman turned his gun on them inside a checkpoint.
The UK servicemen, three from the Grenadier Guards and two from the Royal Military Police, died when the officer opened fire at Nad-e-Ali in Helmand Province on Tuesday.
A manhunt has been launched for the killer, who may have links to the Taliban, according to reports.
The British soldiers were living and working at the checkpoint as part of a team mentoring the Afghan National Police (ANP).
One of the Afghan policemen apparently fired without warning before anyone could respond, then fled the scene.
Sources named the attacker as a man called Gulbuddin and suggested he was connected to the Taliban, the BBC reported.
A UK military spokesman said: "It's our understanding that one individual Afghan National Policeman, possibly in conjunction with another, went rogue. His motives and whereabouts are unknown at this time. Every effort is now being put into hunting down those responsible for this attack."
Four of the soldiers were killed immediately and the fifth died of his wounds, the Nato-led International Security Assistance Force (Isaf) said.
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Another six UK servicemen and two ANP officers were injured in the incident. The troops' families have been informed.
The British casualties were evacuated to the field hospital at Camp Bastion in Helmand by Medical Emergency Response Teams using Chinook helicopters and a US Black Hawk.
