The top U.N. official in South Sudan is warning that the country is teetering on the edge of renewed civil war.

The world’s youngest republic, and one of its poorest, is on the brink of returning to a civil war as its unelected state leaders prepare for another armed showdown.

The U.S. has revoked all visas held by South Sudanese passport holders due to South Sudan's refusal to accept repatriated citizens. This decision amidst fears of a return to civil war as tensions rise following Riek Machar's house arrest,