South Sudan blamed the attack on renegade troops in control of the breakaway region.
The US military aircraft were heading to Bor, the capital of the state of Jonglei and scene of some of the nation's worst violence over the last week. One American service member was reported to be in critical condition. Officials said after the aircraft took incoming fire, they turned around and headed to Kampala, Uganda. From there the service members were flown on to Nairobi, Kenya for medical treatment, the officials said.
Officials at the US military's Africa Command did not immediately answer phone calls or emails today.
South Sudan's military spokesman, Col. Philip Aguer, said that government troops are not in control of Bor, so the attack on the US aircraft has to be blamed on renegade soldiers, he said.
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South Sudan President Kiir, an ethnic Dinka, said this week that an attempted coup triggered the violence now pulsing through South Sudan. He blamed the former vice president, Machar, an ethnic Nuer. But officials have since said a fight between Dinka and Nuer members of the presidential guard triggered the initial violence late Sunday night. Machar's ouster from the country's No. 2 political position earlier this year had stoked ethnic tensions.
The violence has killed hundreds and has world leaders worried that a full-blown civil war could ignite in South Sudan. The south fought a decades-long war with Sudan before a 2005 peace deal resulted in a 2011 referendum that saw South Sudan break away from the north, taking most of the region's oil wealth with it.
The UN Security Council on Friday said the weeklong violence resulted from a "political dispute among the country's political leaders" that could affect not only South Sudan, but neighbouring countries and the entire region.
US President Barack Obama earlier this week dispatched US troops to help protect the US Embassy in the capital, Juba. The US Embassy organised at least five emergency evacuation flights to help US citizens leave the country. Other countries like Britain, Germany and Italy also helped citizens evacuate.