South Sudan rebels say govt troops attack base in north, threaten retaliation

By Denis Dumo JUBA (Reuters) - Rebel forces in South Sudan said government troops attacked their garrison in a town in the north on Tuesday, and they threatened swift retaliation, stoking fears of another full-blown military confrontation in the young nation. Political rivalry between South Sudan's president, Salva Kiir, and former vice president, Riek Machar, sparked a civil war in 2013. Although the pair signed a shaky peace deal a year ago, fighting has continued and Machar fled the country i