Indian Prime Minister Manmohan Singh, second right, reviews an honor guard, as he is welcomed by Iranian President Mahmoud Ahmadinejad, right, for their meeting in Tehran, Iran, Wednesday, Aug. 29, 2012.... (Associated Press) 
 
 In this photo released by the official website of the Iranian Presidency Office, Iranian President Mahmoud Ahmadinejad, right, shakes hands with U.N. Secretary-General Ban Ki-Moon, at the start of their... (Associated Press) 
 
 Indian Prime Minister Manmohan Singh, left, is welcomed by Iranian President Mahmoud Ahmadinejad, right, for a meeting, in Tehran, Iran, Wednesday, Aug. 29, 2012. 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. DUBAI Iran has no interest in nuclear weapons but will keep pursuing peaceful nuclear energy, Supreme Leader Ayatollah Ali Khamenei told heads of state from developing countries in Tehran.
– Egypt's new president arrived in Iran today for a historic visit, the AP reports—and he promptly sparked a walkout at the Nonaligned Movement Summit. Mohamed Morsi, the first Egyptian leader to visit Iran since Tehran cut diplomatic relations with Egypt in 1979 over its peace treaty with Israel, praised the Syrian rebels—thus angering the Syrian delegation, which left the meeting. Morsi called the Syrian uprising a "revolution against an oppressive regime," the BBC reports, and called for the Nonaligned Movement to support it. More from the summit: UN Secretary General Ban Ki-moon, whose presence at the summit is bugging the US, met with Iran's Supreme Leader Ayatollah Ali Khamenei and President Mahmoud Ahmadinejad yesterday to ask that Iran, one of the Syrian regime's last remaining allies, try to get the Syrian government to end the violence. But Khamenei insists the government should continue to be armed while the rebels should have no weapons, reports the AP. Khamenei also insisted Iran is not interested in developing nuclear weapons, but will continue to pursue nuclear energy, Reuters reports. "Our motto is nuclear energy for all and nuclear weapons for none," Khamenei said, calling nuclear weapons "a major and unforgivable sin." But the Wall Street Journal reports that an Iranian scientist considered to be a nuclear weapons guru a la Robert Oppenheimer has resurfaced after a few years off the job. Mohsen Fakhrizadeh is back at work, UN investigators find, prompting more concern over Iran's nuclear agenda. Fakhrizadeh's work had been frozen in 2006; he is believed to be running a nuclear weapons-minded research facility in the suburbs of Tehran.