An initial investigation into the deaths of a female Army medic and a Royal Marine in Afghanistan has ruled out friendly fire from British or American forces as the cause.
But the Ministry of Defence says it still cannot confirm if an off-duty Afghan policeman nearby fired the shots.
Corporal Channing Day was killed alongside Corporal David O'Connor on Wednesday.
Watch this report from Sascha Williams.
Tributes have been paid to Channing Day, a medic with 3 Medical Regiment, who was killed on patrol in Afghanistan on Wednesday.
It is still not clear exactly what happened. But a young woman is dead and a young Marine from 40 Commando has died beside her.