DC Air Scare?

Less than 10 minutes ago I heard what sounded like a fighter jet roaring overhead as I walked back to my office from lunch. (It seemed to be moving so quickly, and my view was obscured by some trees, that I didn't actually see it.) Based on the sound of things, it was headed to the northwest. No word on what (if anything) it might have been -- or been after -- at any of the usual news sites.

Did anyone else see/hear anything?