VIENNA -- The head of the United Nations' nuclear watchdog renewed calls Monday for Iran to provide "timely and proactive co-operation" in inspections that are part of the deal meant to prevent it from developing nuclear weapons.

Last month, in its first report since the U.S. withdrawal from the 2015 nuclear deal that Israel also opposes, the International Atomic Energy Agency said Iran continues to stay below the maximum level of uranium the deal allows it to enrich.

The agency's report also said Iran appears to be fulfilling other obligations, but is slow when it comes to "complementary access" inspections.

IAEA Director General Yukiya Amano told the agency's board of governors in Vienna on Monday that "timely and proactive co-operation by Iran in providing such access would facilitate implementation ... and enhance confidence."

At a news conference later, Amano said his statement was "not an expression of concerns or complaints, but rather an encouragement to Iran."