Heavy fighting in South Sudan risks return to civil war

Clashes between the forces of President Salva Kiir and Riek Machar - the former rebel leader who became vice president under a deal that ended a two-year civil war - have killed hundreds of people since they broke out in the capital Juba four days ago. A United Nations official said heavy gunfire had erupted around U.N. bases where hundreds of civilian have fled to shelter The fighting broke out last week as the world's newest nation prepared to mark five years of independence from Sudan at the