The UN Security Council has "condemned in the strongest terms" the escalation of fighting in Juba, the capital city of South Sudan, which began on July 7.
In a statement released by the council, they urged an immediate end to the fighting and demanded that both sides do all they can to prevent violence spreading.
It also urged that both sides commit to a "full and immediate implementation of the peace agreement, including the permanent ceasefire and redeployment of military forces".
The United States has called for an immediate end to renewed fighting in South Sudan's capital city Juba, in which dozens of civilians have been killed.
In a press statement, the US State Department said it "strongly condemns" the fighting, and calls on both sides to "immediately restrain their forces" from fighting further.
The United States strongly condemns the latest outbreak of fighting in Juba today between forces aligned with President Salva Kiir Mayardit and those aligned with First Vice President Riek Machar Teny, including reports we have that civilian sites may have been attacked.
We again call on both leaders and their political allies and commanders to immediately restrain their forces from further fighting, return them to barracks, and prevent additional violence and bloodshed.
The United States is determined to ensure appropriate measures are taken to hold accountable those responsible for continuing fighting and violations of international humanitarian law, including attacks on the UN Mission in South Sudan (UNMISS) and targeting of civilians.
We are in active communication with African Union and regional leaders at the most senior levels; all are working jointly to press the South Sudanese leaders and their commanders to end the fighting. We have asked for an emergency session of the UN Security Council to address the situation.
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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".
UNMISS deeply concerned about fate of crew, has dispatched a search & rescue team to site of incident.
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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: