Fears that South Sudan - the world's youngest nation - could plunge into a new civil war have intensified after the party of suspended Vice-President Riek Machar called for "regime change".
The call came after Machar - currently under house arrest - was charged with murder, treason and crimes against humanity.
His party, the Sudan People's Liberation Movement In Opposition (SPLM-IO), has denounced he charges as a "political witch-hunt" to "dismantle" a 2018 peace accord that ended a five-year civil war.
Meanwhile, extra troops from neighbouring Uganda have been deployed to South Sudan's capital, Juba, in a bid to strengthen the government's grip on power.
The latest crisis comes as a UN report has accused South Sudanese officials of stealing billions of dollars in oil revenues, and leaving millions of people without essential services.
