A group of youths went on a rampage this week at the Al Waral camp in Sudan's southern White Nile state -- the country's biggest camp, which houses more than 50,000 South Sudanese refugees.
They burned down administrative buildings and looted warehouses, UN refugee agency UNHCR said.
The violence started Tuesday after reports that a refugee youth had died in police custody, the agency said in a statement today.
At least 78 people were arrested in connection with the violence, according to the Sudanese Media Centre (SMC) which is close to Sudan's powerful intelligence agencies.
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Authorities have identified three locations for the smaller camps, he said, adding that the move would help authorities monitor the camps.
Digna said new refugees would be required to register with the authorities before being allowed into the camps.
Noriko Yoshida, UNHCR's Sudan representative, appealed for calm and urged refugees at the camp to use appropriate, legal channels to express their concerns.
"Refugees, like everyone else, are subject to obey the law," she said, adding that South Sudanese refugees were "themselves victims of conflicts and violence seeking safety in Sudan".
South Sudan gained independence from Sudan in 2011, but has been engulfed by war since 2013 after President Salva Kiir accused his rival and former deputy Riek Machar of plotting a coup.