Within a few days, thousands of people were dead — the exact count is unknown — and tens of thousands more were seeking shelter from the violence.
In Juba, the disheveled capital city, many of those from the Nuer tribe, feeling at a disadvantage to the dominant Dinka, sought safety on two sprawling bases of the United Nations peacekeeping mission. Almost four months later they remain. Shipping containers are double-stacked around the perimeter, blocking stray gunfire. Blue-helmeted Mongolian troops tightly control the handful of entrances.
In the larger of the two UN bases more than 21,000 Nuer remain packed under endless streams of plastic sheeting stretched between poles. It is crowded and it smells bad. Yet few talk about wanting to go to the second site the UN has offered across town.
"There's no security in Juba, so people are targeted for violence. The Nuer are targeted," said John Nur, a young man who said that before the crisis he worked for the International Republican Institute, a U.S.-based nongovernmental organization promoting democracy worldwide.
"The government says it's just isolated drunks with guns causing the problems, but they haven't arrested anyone. So people are still afraid of returning home."
Some camp residents venture out during the day to a nearby market. A few go to jobs before returning to the camp by nightfall. One Nuer member of the South Sudan parliament commutes to legislative sessions from his tent in the camp.
From the first moments of the violence, camp residents have been accompanied by a group of Catholic sisters from India.
"We've been working in the bush with war-affected people, but when we heard the cry of the people here, we came on the first day to provide trauma counseling and to work with the women and children," said Sr. Amala Francies, project co-ordinator in South Sudan for the Daughters of Mary Immaculate.
The sisters return daily, bringing food, counseling women and organizing activities for children. There are no formal schools in the camp, so were it not for the opportunity to gather with the sisters in a few large tents donated by UNICEF, the kids would have nothing to do.
"We want to give the children an opportunity to leave their trauma behind for a few minutes, to give them some freedom. We teach them English and some of their letters," said Sr. Amala.
The nuns also work for reconciliation.
"We see that tribalism is very high," Sr. Amala explained. "The people focus on their tribe, not on the development of the whole country. So we work with the children to quit thinking about just me, but rather about us, about the larger community, which is the only way you can develop this country. As we make headway with the children, they go home and teach their parents, who rather than thinking about just me and you, need to think about the whole country."
The congregation has about 20 sisters in South Sudan. Half of them serve a remote area near Wau, while the others are in Juba and have made the camp their parish, despite sporadic outbreaks of violence.
"At first the sounds of gunfire made us worry a lot, but we reminded ourselves that it was God who called us to this service," Sr. Amala said. "And then slowly, as we have lived with the people amid their fear and needs, our own fears and worries were lost. It is God's plan, not ours, so the more we focus on God's work, the less space there is for worry."
The UN's operation of the camps has drawn criticism. Some Dinka leaders have accused the international organization of harbouring assassins in the camps. Doctors Without Borders accused senior UN officials April 9 of a "shocking display of indifference" toward the wellbeing of camp residents as the rainy season gets underway and the camp inexorably turns into a muddy quagmire.
Apart from the inevitable political controversy the camp generates, the sisters' quiet ministry of accompaniment remains critical, one UN official admitted.
"The United Nations mission and all the humanitarian groups work to provide material things like water, food, latrines and health services, but the human person is more than all those, so for the sisters to be present and sing and laugh while they visit and pray with people is so important," said Analia Ramos, a ration officer from Argentina. "The Daughters of Mary Immaculate have been able to show the people in the camp the face of Jesus and Mary that we, because of so much work, at times forget about."
The sisters also provide the framework for a larger Catholic presence in the camp. Several priests and other religious regularly visit the sick in the small camp hospital. Sunday Mass is celebrated by priests from Juba.
Among recent celebrants was Maryknoll Father Jim Noonan from the United States. He said the singing and dancing during Mass left him convinced that camp residents retain "a deep sense of God's presence" amid the many challenges they face.
"They are not prisoners there, but neither are they home where they want to be," Noonan said. "They told me that it is their faith that allows them to endure hardship, and that despite the difficulties, God is with them. So they enthusiastically celebrated that they have not been abandoned."