Nation mourns Navy Yard shooting victims

A woman who said she works at the Washington Navy Yard looks at a memorial to the shooting victims on Wednesday, September 18. Authorities said 12 people -- plus the gunman -- were killed in the shooting on Monday, September 16. <a href='http://www.cnn.com/2013/09/16/us/gallery/navy-yard-shooting/index.html'>View photos from the scene of the rampage.</a>

A woman who said she works at the Washington Navy Yard looks at a memorial to the shooting victims on Wednesday, September 18. Authorities said 12 people -- plus the gunman -- were killed in the shooting on Monday, September 16. View photos from the scene of the rampage.