The FBI Washington field office has confirmed no assault weapons were used in the shooting at the Navy Yard Monday.
Initial media reports saying Aaron Alexis used an AR-17 rifle were incorrect due to information provided by investigators.
The FBI now says a shotgun and two pistols were used to kill 12 people.
It is believed Alexis took the pistols from law enforcement officers after he gained access to the facility.
(Washington, D.C.) Twelve people are dead and at least eight people have been shot at the Washington Navy Yard.
A Navy official confirmed at least two people opened fire on the base this morning but there are conflicting reports on the number of shooters.
One shooter, 34-year-old Aaron Alexis of Fort Worth, TX, is confirmed dead.
The Washington, D.C. police chief said they are looking for two other suspects however recently said they eliminated one of those people as suspect.
The incident occurred at 8:20 a.m. when several shots were fired inside the headquarters for Naval Sea Systems Command in southeast Washington, D.C. An “active shooter” remained inside the building, the Navy said.
The Navy first informed the public of the incident in a Twitter message.
Emergency personnel remain on scene and a “shelter in place” order has been issued for Navy Yard personnel.
The headquarters — the workplace for about 3,000 people — is the largest of the Navy’s five system commands.
The Naval Support Activity Mid-South base is located in Millington.