Senator Claire McCaskill reports on Twitter that shots have been fired outside the Capitol:
Shots fired outside the Capitol. We are in temporary lock down.
— Claire McCaskill (@clairecmc) October 3, 2013
One House member says the "shooter has been arrested."
I am told shooter has been arrested. House floor activity stopped for now.
— Tim Griffin (@TimGriffinAR2) October 3, 2013
And there's this:
— HuffPost Politics (@HuffPostPol) October 3, 2013
— Judd Legum (@JuddLegum) October 3, 2013