South Sudan's government has sent in troops to secure United Nations compounds across the country.
It follows an attack on a UN base in Bor on Thursday, in which at least 58 people were killed, and 100 others were injured.
A mob of armed civilians pretending to be peaceful protesters delivering a petition to the UN had forced their way on to the base sheltering some 5,000 civilians on Thursday and opened fire.
The United Nations Security Council has said that the attack may "constitute a war crime".
Al Jazeera's Anna Cavell reports from Juba, where she spoke to some of the survivors.