Vienna ? Iranian construction of a previously secret uranium enrichment site is at an advanced stage, with high-tech equipment already in place at the fortified facility ahead of its 2011 startup, the International Atomic Energy Agency said in a report Monday.

The revelation of the existence of the underground plant known as Fordo, near the holy city of Qom, has heightened concerns of other possible undeclared Iranian facilities that are not subject to IAEA oversight and therefore could be used for military purposes.

In Washington, State Department spokesman Ian Kelly said the IAEA report “underscores that Iran still refuses to comply fully with its international nuclear obligations.”