The base was placed on lockdown after 9 a.m. ET while officials executed safety protocols and cleared every room to ensure there was no actual gunman.
Erik Ortiz and Pete Williams and Courtney Kube, NBC News
Thu, 06/30/2016 - 7:29am
The base was placed on lockdown after 9 a.m. ET while officials executed safety protocols and cleared every room to ensure there was no actual gunman.