Thousands have been killed since conflict erupted after power shift

South Sudan's president signed a peace deal on Wednesday to end a 20-month conflict with rebels, but he told regional African leaders at the ceremony that he still had "serious reservations".

President Salva Kiir, who has led South Sudan since it seceded from Sudan in 2011, last week asked for more time for consultations, drawing threats of UN sanctions if he failed to ink it within a two-week deadline.