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 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 peace.

The arrest of Vice President Riek Machar could trigger a new wave of fighting in Africa's youngest nation. Analysts are urging the international community to push for peace in the fragile country.