LIVE: Quantico shooting news conference

Published On: Mar 22 2013 03:44:00 AM PDT   Updated On: Mar 22 2013 04:32:33 AM PDT
Marine Corps Base Quantico

7 a.m. ET: Authorities hold a news conference regarding a shooting that prompted a lockdown for hours at a Marine base in Virginia, which ended with three dead, including the gunman.