The detention of South Sudan's First Vice President Riek Machar has effectively collapsed the peace deal that ended the 2013-2018 civil war, his party said.
The UN peacekeeping mission in South Sudan (UNMISS) called for restraint, saying the country stood on the brink of relapsing into widespread conflict.
"This will not only devastate South Sudan but also affect the entire region," UNMISS said in a statement.
The civil war—fought between forces loyal to Machar and his rival, South Sudan's President Salva Kiir, often along ethnic lines—left hundreds of thousands of people dead. It ended in a deal that brought both men together in a fractious national unity government.
Machar's SPLM-IO party said South Sudan's defense minister and its chief of national security "forcefully entered" Machar's residence in the capital, Juba, on Wednesday evening to deliver an arrest warrant.
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