A British aid worker has reportedly been killed the capital of South Sudan, news agency Associated Press has reported.
Presidential spokesman Ateny Wek Ateny said the man was entering his compound in Juba last night when gunmen shot him dead, according to AP.
The victim is said to have worked for the Carter Centre, which was set up by former US president Jimmy Carter and is working in several areas of the troubled country.
South Sudan has been suffering a civil war for more than a year after political divisions between President Salva Kiir and his former deputy, Riek Machar ,spilled into widespread violence.
The United Nations says tens of thousands have been killed, and nearly two million are displaced, leading to the world's largest single-country humanitarian effort.
Three member of a UN peacekeeping helicopter crew that crashed in South Sudan have died, the UN said. One survivor is being treated.
The cause of the crash remains unclear.
The UN Mission in South Sudan has said that one of its helicopters has crashed close to the small town of Bentiu in Unity State.
UNMISS said it was "deeply concerned about fate of crew".
Children's charity Save the Children have launched an appeal for donations for the African nation of South Sudan, which is on the brink of a famine.
ITV News looks at the numbers surrounding the current conflict in the region:
Caroline Anning from the charity Save the Children has warned the situation in South Sudan is similar to the east African famines in the 1980s.
Speaking to ITV News' Dan Rivers she said: "If it continues and we can't get the help we need, we could be looking at a catastrophic famine."
Save the Children are set to launch a worldwide appeal to help and protect the vulnerable children in troubled states of South Sudan, as the country is on the brink of a famine.
Chief executive of the charity Justin Forsyth said:
Save the Children have launched an appeal for donations for the African nation of South Sudan, which is on the brink of a famine.
The children's charity said that without immediate action the situation will deteriorate catastrophically, as across the world’s youngest nation, 2.5 million children are struggling without the basic means to survive.
ITV News correspondent Dan Rivers reports:
The United Nations has already warned that without a cash injection, South Sudan will face the worst starvation in Africa since the 1980s.
Pete Walsh, Save the Children’s Country Director in South Sudan, has spoken of the need for funds to provide Sudanese families with aid.
He said: "Save the Children’s feeding clinics are dealing with an influx of severely malnourished children, brought in by terrified mothers, many of whom arrive after walking for miles.
"We urgently need to raise funds to provide families with life-saving food supplements."
The United Nations is warning that the food security situation in South Sudan is reaching critical levels.
The UN measures food security and hunger rates in a five phase scale: last week the UN said a third of the population was experiencing emergency levels of food insecurity, they are now reporting more people are in the fourth phase, but not yet at famine.
The next classification will be out in three months time - but if the situation continues in this way then certain areas could deteriorate into famine, which is why the donors are meeting today in Oslo - the situation is urgent and the UN is warning donor countries they must act.