Campaigning has ended in Iran's closely contested presidential election, but analysts expect Friday's poll to produce no outright winner without a runoff election.
Supporters of rival candidates campaigned in Tehran early Thursday morning, in a last minute effort to win over undecided voters.
Several hundred pro-reform demonstrators marched in the capital, calling for a boycott of the polls. Police later dispersed the protesters.
Opinion polls show former president Akbar Hashemi Rafsanjani is leading in the race to replace President Mohammad Khatami, who is barred from running for a third consecutive term. Mr. Rafsanjani's main rivals are top reform candidate Mostafa Moin and the conservative former national police chief Mohammad Baqer Qalibaf.
Three hard-line conservatives are still in the race after a fourth dropped out Wednesday.
Some information for this report provided by AP and Reuters.