Today's announcement came as ballots are still being counted. Millions of Afghans voted for a new president and provincial councils in what promises to be the country's first democratic transfer of power.
Abdul Satar Sadaat, of the electoral complaints commission, said today that "election fraud did take place and it might not have been a small amount."
He says the commission received more than 3,000 complaints of possible fraud and promises to invalidate all votes cast irregularly.