South Sudan's President Salva Kiir has sacked his army chief, a military spokesman said, replacing him with a loyalist from his own ethnic group as the country's four-month conflict shows signs of being increasingly fought along tribal lines.
Kiir also replaced his head of intelligence, days after government troops were routed from a major oil hub by rebels loyal to Kiir's former deputy Riek Machar, and hundreds of civilians were massacred.