Speaking at an international conference on terrorism in Tehran, Ahmadinejad said: "If the black box of the 9/11 incident and Holocaust were opened, then some of the truth would be exposed, but the United States does not allow this."
He further added: "There are those who believe that the goal of 9/11 was to revive the Zionist regime, reinforce stability in the region, divert US public opinion from the poor economic state. In terms of reference and benefits, 9/11 is very similar to the Holocaust."
Among the participants in the conference were Sudanese President Omar al-Bashir who has been accused of war crimes and genocide in Darfur, and leaders of Pakistan, Afghanistan and Tajikistan.
Iran claims more than 60 countries were represented in the conference including UN envoys. Earlier this month, the Islamic Republic convened an international convention on nuclear disarmament.
A statement on behalf of Iran's Supreme Leader Grand Ayatollah Seyyed Ali Khamenei was read during the conference. "Reigning powers are using terrorism to achieve illegitimate goals as part of their policy," it said.
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