The two leading candidates in the race to become Afghanistan's next president rallied supporters and urged election officials to come clean on fraud on April 27 as the country readied for an expected grueling runoff in June.

Abdullah Abdullah and Ashraf Ghani, both ministers in the transition government after U.S.-led forces drove the Taliban from power in 2001, shared over three-quarters of the nearly 7 million votes cast, but neither clinched an absolute majority.

If, as expected, the final results due mid-May show no outright winner, a second round will be held on June 7.