It is astonishing to me that the two airliners landed at DCA without radio contact with the tower and were not forced to divert to IAD... the report said that the aircraft landed as if DCA were an uncontrolled airport. NBC reported that one of the aircraft did a missed approach on its first approach when they were unable to raise the tower. Were the airport police contacted by TRACON?
TRACON then said, "It's happened before."
http://www.nytimes.com/2011/03/24/us/24airport.html