Iran on Thursday warned UN Secretary-General Ban Ki-moon against "double standards" after he condemned Iranian President Mahmoud Ahmadinejad's anti-Israeli speech at this week's UN racism conference in Geneva. In a letter to Ban, Iran's UN ambassador, Mohammad Khazaee said the condemnation went against the requirement for the UN secretary-general to be "impartial and fair." "Utmost vigilance should be exercised in order to prevent any situation where the United Nations and its distinguished officials would be seen as applying selective approaches, practicing double-standards or taking biased positions," Khazaee said. "All these incomprehensible reactions have been made against the statement of (Ahmadinejad) while the United Nations and its officials have remained silent on (the) Israeli regime's abhorrent crimes against the innocent Palestinians, and on the threats, allegations and distortions made against ... Iran by the Israeli regime," he continued. Khazaee also blasted a walk-out by European Union delegates during Ahmadinejad's speech, calling it a "manifestation of intolerance." The envoy said Ahmadinejad had been "subjected to unfair and unwarranted harsh criticism only for having tried to pronounce the positions of the country that he represents." The letter maintained that the Iranian president had merely expressed "what, in our view, constitutes the position and the concern of the overwhelming majority of the UN member states on the plight of the Palestinian people caused by the Israeli regime's policies and practices."