[milford421]

"Nothing to be worked up over"

Maybe and maybe not. There are also these related stories:
Airborne Bacteria May Have Been In Air Over DC, CDC Says

http://www.wtkr.com/Global/story.asp?S=3923156&nav=ZolHbyvj
Over 30 Tuleramia Cases in Russia
http://www.interfax.ru/e/B/politics/28.html?id_issue=11369656
Rare Germs Found in D.C. but No Terror Fears
http://www.abcnews.go.com/US/Health/story?id=1174699

[kjam22]

Now they are asking gender and nationality of the bomber.... that is unknown.

No motive known. Reporter bimbet says she talked to witnesses, but she knows nothing???