TEHRAN, Iran – The U.N. chief jolted his Iranian hosts for a nonaligned nations meeting Wednesday by pointing out "serious concerns" in Tehran's human rights record and urging cooperation with the world body to improve freedoms.

U.N. Secretary-General Ban Ki-moon had signaled he would not shy away from criticism of Iran during his visit to the Nonaligned Movement gathering in Tehran, but the sharp comments appeared to catch Iranian officials off guard just hours after his arrival.

"We have discussed how United Nations can work together with Iran to improve the human rights situation in Iran. We have our serious concerns on the human rights abuses and violations in this country," he told a news conference as he sat next to Iran's Parliament Speaker Ali Larijani, who frowned at the remarks.