Two foreign troops were killed when a man dressed in Afghan army uniform shot them dead in southern Afghanistan.

Two foreign troops were killed when a man dressed in Afghan army uniform shot them dead in southern Afghanistan.

"Two International Security Assistance Force service members were killed today in southern Afghanistan when an individual wearing an Afghan National Army uniform apparently turned his weapon on Afghan and coalition forces," the alliance force said in a statement.

It said the shooter was also killed in the incident but gave no further details.

The announcement came as a suicide car bomber in the capital Kabul struck a US-run NATO bus.