Iranian state agency IRNA quoted a representative of the Quds force as saying that the elusive leader of Daesh was dead but later the statement was withdrawn.
Iran's defeated conservative candidate Ebrahim Raisi says he will not "keep quiet in the face of the injustice."
Iran's most powerful authority, Supreme Leader Ayatollah Ali Khamenei, on Tuesday called Iranians to take part in Friday's demonstrations to show Iran is not frightened of American "threats."
About 88 people, including firefighters, were also injured when the Plasco building caught fire and collapsed.
Iran votes in second round of parliamentary elections for nearly a quarter of parliament's seats.
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