Iran’s envoy to the IAEA, Reza Najafi, later said his government and the U.N. agency had reached a “general understanding” about cooperation and resolution of the agency demands for aggressive inspections of Iranian facilities and for access to scientists who can explain suspected past military research.

Najafi said experts would meet to sort out the details and a timetable for dealing with the issues.

A senior Iranian official in Vienna said Tehran will provide limited access to “individuals and places” related to its nuclear program, as stipulated in an arms control pact called the Additional Protocol, which is part of the Nuclear Nonproliferation Treaty. Iran is a signatory to the treaty.

“We have nothing to hide,” the official told reporters.