UNITED NATIONS - UN chief Ban Ki-moon met Iran's president and supreme leader in Tehran on Wednesday and urged them to take concrete steps to prove the country's nuclear program is peaceful.
He also called on all states to stop supplying arms to the conflict in Syria, Ban's spokesman, Martin Nesirky, said.
He told reporters in New York that in separate meetings with President Mahmoud Ahmadinejad and Supreme Leader Ayatollah Ali Khamenei, the secretary-general further said that he considered their latest verbal attacks on Israel to be offensive, inflammatory and unacceptable.
Ban arrived in Tehran on Wednesday for a three-day visit to attend a meeting of some 120 non-aligned nations. He defied calls from the United States and Israel to boycott the event.
"On the nuclear question ... he said that he regretted that little tangible progress has been achieved so far," Nesirky, speaking by telephone from Tehran, told reporters in New York.