A man wearing an Afghan army uniform has shot and killed two international service members, according to Nato.
The attack happened at a military base in the south of the country, a statement by the International Security Assistance Force (Isaf) said.
The attacker was killed by coalition troops, Isaf said. The nationalities of the soldiers have not been released.
The incident comes after several Afghan civilians were killed in an attack for which a US soldier has been charged.
An official in the Afghan defence ministry has told the BBC that the attack happened in Helmand province, and that the attacker was an Afghan soldier.
The spokesman for the governor of Helmand has told the BBC that the shooting followed a "verbal clash" between Afghan and Nato soldiers, and that the Afghan involved was from Kunar province.
This attack is the latest in a number of what's termed "green on blue" incidents - where members of the Afghan security forces turn their weapons on their international colleagues or trainers.
The number of these incidents has risen since the inadvertent burning of Korans at a US base in February.
Tensions were inflamed further by the killing of seventeen Afghan civilians earlier this month.
US Staff Sgt Robert Bales, 38, has been charged with killing nine Afghan children and eight adults in their homes in Kandahar province on 11 March.
He could face the death penalty if convicted.
The case has undermined US relations with Kabul and led to calls for Nato to speed up its planned withdrawal of troops from Afghanistan.
Sgt Bales' trial could take years, contrasting with Afghan demands for swift and decisive justice.
The Taliban called off peace talks in the wake of the deadly rampage.
BBC News - Nato troops killed by a man dressed in Afghan army uniform
The attack happened at a military base in the south of the country, a statement by the International Security Assistance Force (Isaf) said.
The attacker was killed by coalition troops, Isaf said. The nationalities of the soldiers have not been released.
The incident comes after several Afghan civilians were killed in an attack for which a US soldier has been charged.
An official in the Afghan defence ministry has told the BBC that the attack happened in Helmand province, and that the attacker was an Afghan soldier.
The spokesman for the governor of Helmand has told the BBC that the shooting followed a "verbal clash" between Afghan and Nato soldiers, and that the Afghan involved was from Kunar province.
This attack is the latest in a number of what's termed "green on blue" incidents - where members of the Afghan security forces turn their weapons on their international colleagues or trainers.
The number of these incidents has risen since the inadvertent burning of Korans at a US base in February.
Tensions were inflamed further by the killing of seventeen Afghan civilians earlier this month.
US Staff Sgt Robert Bales, 38, has been charged with killing nine Afghan children and eight adults in their homes in Kandahar province on 11 March.
He could face the death penalty if convicted.
The case has undermined US relations with Kabul and led to calls for Nato to speed up its planned withdrawal of troops from Afghanistan.
Sgt Bales' trial could take years, contrasting with Afghan demands for swift and decisive justice.
The Taliban called off peace talks in the wake of the deadly rampage.
BBC News - Nato troops killed by a man dressed in Afghan army uniform
