US intelligence agencies believe that Iran's new Supreme Leader, Ayatollah Mojtaba Khamenei, is significantly more open to pursuing a nuclear weapon than his late father.
Bushra Shaikh, a British-Pakistani media personality turned mouthpiece for the Iranian government, shared videos of herself at the multi-day event in Tehran's Enghelab Square.
Iran's new Supreme Leader has hardened his stance on Donald Trump's peace plans as he issued an order demanding that Tehran's near-weapons-grade uranium should not be sent abroad.
High-ranking government officials have reportedly avoided visiting him out of fear that Israeli intelligence could track their movements and use them to locate and target him.