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“The onus is very much on the parties to conflict to avoid causing displacement to the civilian population,” said Jenny McAvoy, director of protection at US NGO alliance InterAction.

It's unclear whether the fee would apply only to newcomers or to those already there as well. Whatever the case, the amount is "absolutely unheard of globally."

The United Nations Emergency Relief Coordinator (ERC) has declared that the humanitarian situation in South Sudan warranted classification as a system-wide Level 3 (L3) emergency.

For humanitarian organizations, the presence of risk in the operating environment can force difficult trade-offs between the needs of people they are trying to serve and the need to mitigate potential harm to their personnel, resources, and reputation.