Tensions are rising in the oil-rich east African nation of South Sudan after Riek Machar who serves as a vice president was arrested in the capital.

The recent outbreak of violence in South Sudan doesn’t appear to have been motivated by political directives from the country’s opposition.

The United Nations chief is urging regional and international leaders to prevent South Sudan from falling “over the abyss” into another civil war, and to speak with one voice to support a return to pe