By RODNEY MUHUMUZA
May 21, 2015 2:06 PM
Despite the spike in fighting the international community is "reluctant to take bold steps toward addressing repeated atrocities," Michelle Kagari, deputy director with Amnesty International, said in a statement.
It spoke by satellite phone to a member of staff who had fled to an island in a swamp with many residents of the town.
"Men with guns came on to the island and started shooting at the civilians," Paul Critchley, MSF's South Sudan head of mission said at a news conference.
Everyone ran into the water where they hid for about nine hours.
MSF estimated that half a million people in Unity State are hiding with no access to clean water, food or healthcare.
"They will be trying to live off wild fruits, susceptible to malaria, susceptible to diarrheal diseases, have little or no shelter," Critchley said.
Civilians and medical facilities have been targeted repeatedly in South Sudan's conflict, which has reopened ethnic faultlines between Kiir's Dinka people and Machar's forces, who are largely ethnic Nuer.
There has also been heavy fighting in Melut, close to a major oilfield in Upper Nile State. MSF staff ran to the United Nations base in the town on Tuesday, where they have been treating eight people who were shot.