UN spokesman Stephane Dujarric said the armed fighters and civilians crossed into Congo from South Sudan with Machar, who was evacuated from Garamba National Park with his wife, son and 10 aides on August 17.
He said the UN mission evacuated about 300 of Machar's supporters from Garamba Park, in northeast Congo near the border with South Sudan, between August 24 and September 5, on humanitarian grounds.
A peace deal reached in August 2015 which established a unity government has been violated regularly by fighting. Machar, who was vice-president again, fled the capital Juba in July after fighting with forces loyal to Kiir, which left hundreds dead. Machar then slipped across the border to Congo in mid-August, also needing medical treatment. Kiir fired him as vice-president.
As of Thursday, he said, there were an additional 183 individuals in two MONUSCO-run facilities where they are receiving medical treatment or recovering while Congolese and South Sudanese work on a longer-term solution.
Dujarric said the UN is also trying to encourage a solution between authorities in both countries and "regional actors" to the presence in Congo of opposition fighters.
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