From ABC’s Jake Tapper:

After Iran’s secret underground uranium-enrichment facility in Natanz was discovered in 2002 — with 8,000 centrifuge machines, a stockpile of 1,400 kilogram of low enriched uranium — US intelligence expected Iran would try again to build another secret facility.
“Not surprisingly, we found one,” a senior administration official told reporters in a background briefing today.
They found it near the city of Qom, “heavily protected and heavily disguised.”
Over the summer, intelligence officials from the US, UK, and France worked on making a presentation to the International Atomic Energy Agency about the Qom facility.
Its construction in itself is in violation of Iran’s agreement with the IAEA, officials say.

More here.