Iran's reformist ex-president has called on Iranians to cast their votes in the upcoming runoff parliamentary elections on April 29.

In a statement posted on social media networks Sunday, Mohammad Khatami called on his supporters to vote in the runoff elections to "repeat the epic," a reference to the victories by the reformist-moderate camp in February elections.

A total of 136 candidates are contesting 68 seats in Iran's 290-seat parliament.

The reformist-moderate camp has said it needs to win 40 seats in the runoff election to secure the upper hand in the next parliament, which begins its work in late May.

There will be no runoff vote in the Iranian capital, Tehran, where moderates won all 30 seats in the February vote.