Ground stop at DC area airports? [View all]

Daughter is attorney, lives on Capitol Hill in DC. She was buried in work today but now she tells me that for some time this afternoon there was a ground stop at Washington National (also called Reagan National), Dulles International, Baltimore-Washington International (BWI), and Richmond VA International.

Regional air traffic control is in Warrenton, VA -- daughter says story is there was a "chemical odor" at the Warrenton ATC that caused them to empty the building.

I don't find anything on the networks, CNN, or MSNOW. Anyone else hear this?