The US has expressed "concern" over "growing tensions" in South Sudan, and called on all parties to respect a 2018 peace agreement after the opposition withdrew from a body overseeing the process.
The world's newest nation has struggled to draw a line under a five-year civil war that ended in 2018, with former rivals President Salva Kiir and his Vice President Riek Machar unable to agree on the implementation of the deal they signed.
