Iran has no interest in nuclear weapons but will keep pursuing peaceful nuclear energy, Iran's Supreme Leader Ayatollah Ali Khamenei said in the 16th Non-Aligned Movement (NAM) Summit opened in Tehran on Thursday. Khamenei said that "The Islamic republic is not after nuclear weapons" and will never slacken off its right to the "peaceful" use of nuclear energy, adding that Iran's slogan is "Nuclear energy for all, nuclear weapons for none." United Nations Secretary General Ban Ki-moon, attending the Tehran summit, urged Khamenei late on Wednesday to take concrete steps to prove Iran's nuclear work is peaceful. The West suspects Iran is seeking a nuclear weapons capability, an accusation Tehran denies. UN Secretary-General Ban Ki-moon on Thursday urged Iran to remove international concerns over its controversial nuclear program. For the safety of the region and the world, Iran should take measures and build mutual trust to remove international concerns, said Ban in the 16th Non-Aligned Movement Summit opened here in Tehran. This can be done through cooperation with the International Atomic Energy Agency (IAEA), he added.