The U.N. atomic watchdog says Iran continues to stay within the limitations set by the nuclear deal reached in 2015 with major powers, though its stockpiles of low-enriched uranium and heavy water are growing.

In a confidential quarterly report distributed to member states Friday and seen by The Associated Press, the International Atomic Energy Agency said Iran has stayed within key limitations set in the so-called Joint Comprehensive Plan of Action, or JCPOA.

It's the first report since Tehran announced it had increased low-enriched uranium production and gave the signatories to the JCPOA 60 days to come up with new economic incentives to compensate for the unilateral withdrawal of the United States last year.

The IAEA says its inspectors had access to all sites in Iran they needed to visit.