Some heroic rescues took place Monday as workers inside the Washington, D.C., Navy Yard tried to escape the scene of the deadly shooting.
Omar Grant told the Today Show's Carson Daly he led his blind coworker out of Building 197 of the Naval Sea Systems Command Headquarters shortly after the shots were fired.
"I heard the first two shots while I was in the atrium in the cafeteria. I proceeded to take his arm and lead him into the cafeteria...we heard three more shots...we saw people panic running for the exits. I told my colleague we were going to get out of the building, and I was going to help him."
Grant said his co-worker usually has a helper with him, but that person was not at work Monday.
The gunman, 34-year-old Aaron Alexis of Fort Worth, Texas, killed 12 people and injured eight others before he was also killed.
The shooting is one of the worst mass shootings ever at a U.S. military facility and one of the deadliest single events ever in the nation's capital.