why did Rice hide this from the Sept. 11th. Commission?

"I remember that George was very worried and he expressed that," Rice told reporters. "We were all very worried because the threat reporting was quite intense. The problem was that it was also quite nebulous."

What was this "threat reporting" that was quite intense? Did she ever even mention them before the commission? Congress needs to call her back and ask her. They did not do the job before.