Receive Breaking News updates as they occur
By Carl Odera JUBA (Reuters) - Three U.S. aircraft came under fire from unidentified forces on Saturday while trying to evacuate Americans from a spiraling conflict in South Sudan. The U.S. military said four of its members were wounded in the attacks. Nearly a week of fighting in South Sudan threatens to drag the world's newest country into a Dinka-Nuer ethnic civil war just two years after it won independence from Sudan with strong support from successive U.S. administrations. Consequently, U.S. President Barack Obama warned that any move to take power by military means would lead to an end of U.S. and international community support for South Sudan.