Anybody know what is going on in NW DC on Calvert St. past the Omni Shoreham? I work near there and have been hearing sirens since 11:30 a.m. I walked up there a few minutes ago and saw a lot of fire trucks (but there is no fire or smoke that I could see), police cars, an ambulance and other first responder vehicles. I stopped when I saw a guy dressed in a white space suit with a mask and an oxygen tank strapped to his back standing next to one of the fire trucks. Also, even though the situation...