Early reports say at least one police officer was injured in an apparent exchange of gunfire on Capitol Hill this afternoon.
At least three senators, including Pennsylvania Senator Bob Casey reported hearing the gunfire as security moved lawmakers off the floor.
The incident takes place shortly after house members approved a measure that would lift the government's shutdown for national guard troops.
We can not confirm the status of the gunman.
Stay tuned to the stations of Lilly Broadcasting for the latest in this developing story.