The Afghan Electoral Complaints Commission (ECC) has ordered ballots from polling stations in two provinces to be invalidated because of fraud, BBC reported.
It said that there was "clear and convincing evidence of fraud" in a number of polling stations in the provinces Paktika and Ghazni.
A statement on the ECC website said that all ballots in five polling stations in Paktika were invalidated.
In Ghazni the ECC ordered that ballots cast in 27 stations be invalidated.
There were 600-700 ballot papers at each of Afghanistan's 25,450 polling stations, the Independent Electoral Commission (IEC) has said.
Afghans voted in the country's second direct presidential election on 20 August, but the election was marred by low turnout and widespread allegations of vote-rigging, intimidation and other fraud.
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