US soldiers 'killed by defector'
Nato is investigating whether an Afghan National Army soldier killed two coalition service members in southern Afghanistan.
Nato said the coalition and the Afghan government are jointly investigating how the two service members died on Friday evening in Sangin, a dangerous district of Helmand province.
The Taliban issued a statement saying that an Afghan soldier shot and killed the American service members on their base and then defected to the insurgency.
Taliban spokesman Qari Yousef said in the statement that the Afghan soldier killed the Americans, then joined up with insurgents who took him to a safe place.