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on Tuesday opened registration for candidates hoping to succeed President , who will step down following the June 18 after serving the maximum two consecutive terms allowed.

The five-day registration period at the interior ministry ends on Saturday, with the names of candidates then handed to the conservative-dominated Guardian Council for vetting.

More than 20 public figures have officially announced their intention to run, with the final list of those qualified due on May 26-27, the interior ministry said.

Former Revolutionary Guards Corps' official Saeed Mohammad, a general and an advisor to Guards commander Major General Hossein Salami, was one of the first to submit his name Tuesday.

Mohammad, 53, who headed the Guards' construction and engineering arm for over two years, resigned last in March to run.

Another was Mohammad Hassan Nami, an army general who was briefly telecoms minister under former ultra-conservative president Mahmoud Ahmadinejad, state news agency IRNA said.

According to the Hamshahri daily newspaper, Nami is a former military attache to North Korea, and also holds a doctorate in "public management" from Pyongyang's Kim Il-sung University.

Several top political figures are seen as possible presidential hopefuls, but are yet to declare whether they will run.

They include former parliament speaker Ali Larijani, judiciary chief Ebrahim Raisi and Foreign Minister Mohammad Javad Zarif.

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The country's supreme leader, Ayatollah Ali Khamenei, has in recent months urged for high turnout, expressing hope that this would encourage the emergence of new young leaders, as the generation who oversaw the country's 1979 revolution is ageing.

This year's election is also expected to feature a string of military figures, stirring unease over a possible militarisation of the Islamic republic's politics.

The registration process comes as Iran and world powers are engaged in talks to revive a 2015 nuclear accord, from which the US withdrew unilaterally in 2018, reimposing crippling sanctions.