A man wearing Afghan army uniform has shot dead two US-led foreign troops in eastern Afghanistan.

A man wearing Afghan army uniform has shot dead two US-led foreign troops in eastern Afghanistan.

NATO-led International Security Assistance Force (ISAF) said in a statement that an individual wearing an Afghan National Army uniform turned his weapon against two foreign troops in eastern Afghanistan Thursday and killed both soldiers.

“ISAF is investigating the incident,” the statement said, “without giving details about the exact location of the incident or the victims' nationalities.“

The incident is the latest in a string of attacks by Afghan security personnel on foreign forces.

Last week, an Afghan soldier opened fire on American troops at a training base in Pusht-Rod district of western Farah province, killing at least two US soldiers and injuring five others.

In a similar incident in November, an Afghan army soldier injured at least three US-led Australian soldiers in southern Uruzgan province.

In April, an Afghan military pilot opened fire on US-led forces at Kabul airport, leaving eight foreign soldiers dead.

The United States and the NATO leaders have set 2014 as the date to hand over security to local authorities in Afghanistan.

The security situation remains fragile in Afghanistan despite the presence of nearly 140,000 US-led foreign forces.