United Nations officials say an Afghan driver and a doctor with a German aid agency were killed when their UNICEF vehicle was hit in a rocket attack.
A U.N. staffer was severely injured in the attack, which took place Friday near the eastern Afghan town of Herat.
The vehicle was returning from a routine mission in Badghis province with the three men on board.
Taleban rebels launch regular attacks on Afghan and foreign forces, reconstruction projects, non-governmental organizations and government officials, but most of the violence is in the south and southeast of the country.
In April, unidentified attackers stormed a health clinic in Badghis, gunning down five people.
Some information for this report was provided by AFP and Reuters.