Sudan's Umma opposition party has said it will boycott next week's elections, casting further doubt on the credibility of the upcoming poll. The announcement late on Wednesday came a day after another opposition party, the Sudan People's Liberation Movement (SPLM), announced it was widening its partial boycott of the election. Both parties have alleged widespread fraud in the run-up to the vote. "We have decided to boycott the electoral process at all levels," Sarah Nugdalla, head of Umma's political bureau, told a group of journalists after a party meeting in Omdurman, across the River Nile from the capital Khartoum. ...