A U.S. aircraft came under fire on Saturday on a mission to evacuate Americans from spiraling conflict in South Sudan and four U.S. military service members were wounded.
Nearly a week of fighting threatens to drag the world's newest country into an ethnic civil war just two years after it won independence from Sudan with strong support from successive U.S. administrations.
The U.S. aircraft came under fire while approaching the evacuation site, the military's Africa Command said in a statement.
"The aircraft diverted to an airfield outside the country and aborted the mission," it said.
Hundreds of people have been killed in the fighting that pits loyalists of President Salva Kiir, of the Dinka ethnic group, against those of his former vice president Riek Machar, a Nuer who was sacked in July and is accused by the government of trying to seize power.