President Hamid Karzai's rival in the second round of the Afghan presidential election has announced in Kabul that he is withdrawing from the poll.
"I will not participate in the election," Dr Abdullah told supporters, saying his demands for ensuring a fraud-free election had not been met.
But he stopped short of calling for a boycott of next Saturday's vote.
Mr Karzai had rejected his demand that election officials who presided over the first round should be dismissed.