Rafsanjani to stand in Iran election
12 May 2013 Last updated at 11:23 BST
Iranian ex-President Ali Akbar Hashemi Rafsanjani has registered for June's presidential election, a few minutes before an official deadline.
Correspondents say Mr Rafsanjani, 78, is virtually assured the support of reformers and could pose a real challenge to the country's conservative leadership.
Constitutionally, President Mahmoud Ahmadinejad cannot stand again.
But his choice of candidate registered minutes before Mr Rafsanjani.
Susanah Mendonca reports.