Tweets as more news breaks.

https://twitter.com/#!/nbcwashington/status/176884429812281345

https://twitter.com/#!/HugoScheckter/status/176887838124683264

https://twitter.com/#!/nbcwashington/status/176888359355023360

https://twitter.com/#!/nbcwashington/status/176889308899315712

https://twitter.com/#!/nbcwashington/status/176889677167599616

Tags: gunman