Voters in Afghanistan could be heading back to the polls to elect a president.

Election officials will announce soon whether allegations of widespread fraud in the disputed August election will force a second round of voting.

Preliminary results gave incumbent President Hamid Karzai a 54 percent lead over his closest challenger, Abdullah Abdullah.

Rigged ballots could drop Karzai's total below the 50 percent mark, forcing a runoff.

The political uncertainty in Afghanistan could factor in as the White House decides whether to send more troops to the country.