President Hamid Karzai widened his lead over his main challenger in election returns released Saturday, creeping toward the 50 percent mark that would enable him to avoid a run-off in the divisive presidential contest, AP reported. Karzai's top challenger Abdullah Abdullah stepped up his fraud charges, raising doubts whether the former foreign minister's followers would accept the incumbent if he wins in the first round. Accusations of fraud in the Aug. 20 vote have poured into the Electoral Complaint Commission, which must investigate the allegations before final results can be announced. Fraud allegations from Abdullah and other presidential candidates as well as low turnout in the violent south could strip the election of legitimacy, not only among Afghans but also among the United States and its international partners that have staked their Afghan policies on support for a credible government. A widely accepted Afghan government is one of the pillars of President Barack Obama's strategy to turn the tide of the Taliban insurgency. The election controversy has boiled over at a time of rising U.S. and NATO casualties, undermining support for the war in the U.S., Britain and other countries with troops here. -- SPA