Don't be alarmed if you see black smoke & a lot of emergency vehicles around Dulles International Airport tomorrow
FYI: Washington Dulles International Airport (#IAD) will conduct its FAA required full-scale emergency exercise tomorrow Saturday, May 8, from 0600-1230. Black smoke may be visible and an increased number of emergency vehicles will be in the vicinity of the airport. pic.twitter.com/rMp6vgyYLw