TEHRAN — A hard-line politician and former head of the Revolutionary Guards, Mohsen Rezai, announced Wednesday that he would enter the presidential race, indicating additional splintering among the country’s conservatives.

Mr. Rezai, who oversaw the Revolutionary Guards from 1981 to 1997, had been seeking to unite conservative politicians behind another candidate to compete against President Mahmoud Ahmadinejad. But he decided instead to become a candidate himself in the presidential election, to be held June 12, Iranian news media reported.

Mr. Rezai, who has accused Mr. Ahmadinejad of mismanaging the economy, will run as an independent candidate, the ISNA news agency reported.

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