The commission investigating fraud in Afghanistan's presidential election says it has now received more than 550 complaints serious enough to affect the poll's outcome if proved true.

Nellika Little, a spokeswoman for the independent Electoral Complaints Commission, says it has received more than 2,000 allegations of fraud or intimidation involving voting day or the counting of ballots.

She says about 83 percent of those complaints have been processed and 567 given priority status because they could affect results. The figure more than doubles the 270 priority allegations reported Friday.

She says the most common complaints involve polling irregularities such as ballot-box stuffing. The next most common allegation is voter intimidation or attempts to influence voters.