Unknown armed men opened fire on a car of local employees of the U.S. military-civilian Provincial Reconstruction Team (PRT) in Afghanistan's eastern Khost province Thursday, killing one and wounding three, a local official said.

Local employees of the Khost PRT were driving towards their job in Tanai district Thursday morning when unidentified armed men sprayed bullets, killing one person and injured three others, district chief Badiuzaman Sabri told Xinhua, adding all of them were local Afghans.

Taliban militants have warned locals several times not to work for the Americans.

More than 600 people have been killed in militancy and conflicts this year in Afghanistan.

Source: Xinhua