Bizarre Video of Light Beam Exiting the Capitol Dome in Washington DC

Beam me up, Scotty? There’s no audio, just the footage of a beam of light that appears to leave the building and move skyward, and some figures moving around inside the Capitol dome at night.
Seems a little odd. Make of it what you will. ~ BP
Uploaded July 6, 2014
http://youtu.be/2uRN9tcik8M