An Afghan soldier shot dead two soldiers serving with the NATO-led International Security Assistance Force on Saturday, officials said, in the latest "insider attack" to target the coalition.
"Two International Security Assistance Force service members were killed when an Afghan National Army soldier turned his weapon against ISAF service members in western Afghanistan today," ISAF said in a statement.
In line with coalition policy, it did not disclose the nationalities of those who died.
Also on Saturday, a roadside bomb killed five US troops in southern Afghanistan.
"Five American soldiers were killed at about noon when their armoured vehicle hit a powerful roadside mine in Maiwand district," General Abdul Razeq, Kandahar province's police chief, told AFP.
The troops died in an improvised explosive device (IED) attack, ISAF confirmed in a separate statement.