Heavy fighting involving tanks and helicopters raged in South Sudan on Monday between troops loyal to the president and those backing the vice president, risking a return to civil war and further instability in a volatile and poor region of Africa.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.The violence intensified on Monday; a Reuters witness saw two helicopters overhead firing in the direction of Machar's headquarters, while residents reported tanks on the street. A United Nations official said heavy gunfire had erupted around U.N. bases where hundreds of civilian have fled to shelterThe fighting broke out last week as the world's newest nation prepared to mark five years of independence from Sudan at the weekend. The U.N. Security Council on Sunday demanded Kiir and Machar r...

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