There is still no completely paved road in Bor or in the entire state of Jonglei.
The helicopter was apparently shot down on Friday while on a reconnaissance mission in eastern Jonglei state.
BBC: Russia demands action over UN helicopter downed in S Sudan
South Sudan's weak central government has announced an offensive, deploying some 12, 000 soldiers to discourage tribal raiding in Jonglei.
ECONOMIST: Independence has left South Sudan with much to do
My husband too, from being a bush fighter, was now integrated into the army, based in Ayod in Jonglei State.
The MI-8 helicopter went down near the settlement of Likuangole, in the state of Jonglei, in the country's east, the U.N. mission said.
CNN: Russia urges South Sudan to act over downed U.N. helicopter
Besides General Athor, another losing candidate, David Yau Yau, is at large in Jonglei with hundreds of armed followers in Pibor, in the state's east.
Unmiss chief Hilde Johnson said last month that the government was expected soon to launch an offensive against fighters loyal to Mr Yau Yau in Jonglei.
The U.N. mission in South Sudan said the attack was "an ambush by unidentified assailants" near the settlement of Gumuruk in Jonglei, according to a U.N. news release.
CNN: UN: 5 peacekeepers, 7 others killed in South Sudan attack
Tuesday's violence happened in Jonglei state, haven for armed groups.
BBC: Bodies of Indian UN troops killed in South Sudan reach Delhi
India, a major contributor to UN peacekeeping forces around the world, contributes around 2, 200 personnel to two battalions in South Sudan - one based in Jonglei and the other in Malakkal, on the border with Sudan.
BBC: Bodies of Indian UN troops killed in South Sudan reach Delhi
The dispute left South Sudan looking for alternative ways to transport its crude, including a possible route from Jonglei state through Ethiopia to the Port of Djibouti and a second one to the Kenyan port of Lamu.
Correspondents say that Jonglei has been hit by widespread ethnic violence since South Sudan became independent from Sudan in July 2011 - with much of it taking place in Pibor county, where the UN peacekeeping force is based.
The five U.N. peacekeepers were from India and were part of a convoy of 32 Indian peacekeepers that came under attack in an ambush in Jonglei, South Sudan, according to Syed Akbaruddin, spokesman for India's Ministry of External Affairs.
CNN: UN: 5 peacekeepers, 7 others killed in South Sudan attack
Aguer said the southern military, known as the SPLA, would continue to "deal with the militia group" and that it would be a matter of time before the rebels are cleared from Pibor County in the state of Jonglei.
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