Media playback is unsupported on your device

Washington shooting: What is the Navy Yard?

16 September 2013 Last updated at 16:37 BST

Professor Gary Solis, who served with the US Marines and used to work at the Washington Navy Yard, exactly what happens at the site where a shooting took place on Monday.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.