WASHINGTON (AP) -- Defense officials say the suspected Washington Navy Yard gunman was currently working as a defense department contractor, but it's not clear if he was assigned at the military base in southeast D.C.
Defense officials say Aaron Alexis, 34, of Texas, was working as an information technology contractor, but it was not known which company employed him. As a contractor, he could have had a badge that might have gained him access to the base. Alexis was a former Navy reservist, serving from 2007 to early 2011.
The two officials spoke on condition of anonymity because they were not authorized to discuss it publicly.
Embry-Riddle Aeronautical University also says he was an online student pursuing a bachelor's degree in aeronautics. He started classes in July 2012.
Thirteen people were killed during the shooting rampage at Building 197. More than a dozen others were wounded.
Federal law enforcement officials say the man accused in a shooting rampage at the Washington Navy Yard that left at least 12 people dead has been identified as Aaron Alexis.
The two officials spoke Monday to The Associated Press on condition of anonymity because they were not authorized to speak publicly.
One of those officials says Alexis was a 34-year-old from Texas. He is believed to have a criminal record there and to be a holder of a concealed carry weapon permit.
That official says Alexis is believed to have gotten into the Navy Yard by using someone else's identification card. It is not yet clear if that individual was an accomplice or if that person's ID card was stolen.
WASHINGTON (AP) -- Authorities in Washington, D.C., say at least 12 people are dead after a shooting today at the Washington Navy Yard. And they say they are looking for two other possible gunmen.
Police say a third gunman has died, though they're not saying how.
Witnesses describe a gunman opening fire from the fourth floor, aiming down at people in a first-floor cafeteria. Others say a gunman fired at them in a third-floor hallway. It's not clear whether they're describing the same shooter.
Police say the two other potential gunmen were wearing military-style uniforms, including one who was wearing a beret. The police chief says one of them had a long gun, and the other was also armed.
The shooting prompted nearby schools to be put on lockdown. And planes at Reagan National Airport were briefly grounded so they wouldn't interfere with police helicopters. Less than two miles away, security was beefed up at the U.S. Capitol, but police said there was no known threat there.
About 3,000 people work at the Naval Sea Systems Command headquarters. It builds, buys and maintains the Navy's ships and submarines and its combat systems.
SHOOTING-MILITARY BUILDING: WITNESSES
NEW: Witnesses describe gunfire at Navy Yard
WASHINGTON (AP) -- A man who works at the Washington Navy Yard says he and some co-workers encountered a gunman this morning in a long third-floor hallway of the building where they work. Todd Brundige says the man "just turned and started firing."
Co-worker Terrie Durham says the gunman fired toward her and Brundige, but that he "aimed high and missed." She says the gunman said nothing.
Rick Mason, who's a civilian working for the U.S. Navy, says a gunman was shooting from a fourth-floor overlook in the hallway outside his office, aiming down at people in the building's cafeteria. He says he could hear the shots, but couldn't see the gunman.
Shortly after the gunfire, he says someone on an overhead speaker told workers to seek shelter -- and later, to head for the gates at the complex.
Patricia Ward says she was in the cafeteria when the shooting began. She says she heard three gunshots in a row, followed by several more. She says, "We just started running." Security officers were directing people out of the building, with guns drawn.
WASHINGTON (AP) -- President Barack Obama is mourning what he called "yet another mass shooting" in the United States that he says took the life of American patriots.
Obama promised to make sure, quote, "whoever carried out this cowardly act is held responsible."
He said several people were shot Monday morning at the Washington Navy Yard about 3 1/2 miles from the White House, and some were killed.
He said the victims were "courageous Americans" who knew about the risks of serving overseas, but wouldn't have expected such "unimaginable violence" at home.
The White House says the president has been receiving frequent briefings about the unfolding situation by senior aides.
WASHINGTON (AP) -- Authorities say they are looking for two additional suspects in the shooting rampage at the Washington Navy Yard.
District of Columbia Police Chief Cathy Lanier says witnesses reported seeing two additional gunmen, both dressed in military-style clothing.
Lanier says one police officer was wounded in an exchange of gunfire with a shooter. She says one shooter has been killed.
Two Navy officials say at least six people were killed in the rampage.
D.C. Mayor Vincent Gray said at a Monday news conference four people were wounded and taken to hospitals.
WASHINGTON (AP) -- Officials say at least one shooter has died at the Washington Navy Yard, where several people were killed and as many as 10 were wounded.
A federal law enforcement official and a Defense Department official said Monday morning that a shooter had died. Both spoke on condition of anonymity because they were not authorized to discuss the ongoing investigation.
Two other officials have said they are looking into the possibility of a second shooter at the Navy Yard.
Washington, DC (NBC News) Four people were killed and at least 10 were shot - two of the victims police officers - at the Washington, D.C. Navy Yard Monday morning by more than one gunman.
At about 10:20 a.m., one shooter had been reported contained. However, at least one other gunman remained at large.
One of those shot was a D.C. police officer, reported NBC News' Pete Williams. Another was a base security officer.
The conditions of the victims are unknown, but George Washington Hospital reported that at least one victim has been transported to that hospital.
The U.S. Navy said the shooting began at about 8:20 a.m. with three shots fired inside Building #197 at the Naval Sea Systems Command Headquarters, 1336 Isaac Hull Ave. in the Southeast section of the District. U.S. military officials say the gunman - armed with an AR-15, a military-style assault weapon - first shot the base security officer.
One victim was reported to be on the roof of a building, reported News4's Tony Tull. A U.S. Park Police helicopter hovering above the scene around 9:50 a.m. lowered a basket to a building and lifted what appeared to be a shooting victim from the roof. The helicopter came back to the scene just after 10 a.m. to retrieve another victim.
But other details were sketchy from the still-active scene. The shots continued to ring out through the morning, including a volley that Tull reported at about 9:20 a.m.
Authorities originally believed there was a lone gunman, but sources later confirmed to News4 that the shooting was carried out by at least two gunmen.
Federal and local emergency personnel converged on the scene, "and a shelter in place order has been issued for Navy Yard personnel," the Navy said. Among the responders was a federal SWAT unit.
D.C. Public Schools put six schools and one administrative building on lockdown, meaning no visitors or staff may enter or leave the building and recess for students is inside.
Metro has also reopened New Jersey Avenue entrance at the Navy Yard station.
The Navy Yard is located in southeast Washington on the Anacostia River. The Navy says 3,000 people work inside the building, including command staff, headquarters directorates and field activities. They coordinate the Naval Sea Systems Command, or NAVSEA, the largest of the Navy's five system commands.
WASHINGTON (AP) -- Several people were injured in a shooting Monday morning at a building at the Washington Navy Yard, the U.S. Navy said, and authorities searched for an active shooter.
A defense official, who spoke to The Associated Press on condition of anonymity because he was not authorized to speak during an active attack, also said there were at least several injuries.
The Navy said shots were fired around 8:20 a.m. at the Naval Sea Systems Command headquarters, where about 3,000 people work.
The number of the victims and their conditions was not immediately known, though the Navy said multiple people had been injured.
Police and federal agents from multiple law enforcement agencies responded to the scene. Ambulances were parked outside, streets in the area were closed and flights at Reagan National Airport were temporarily halted.
A U.S. Park Police helicopter hovered over the building and appeared to drop a basket or a stretcher with a person onto the roof.
Naval Sea Systems Command is the largest of the Navy's five system commands and accounts for a quarter of the Navy's entire budget. It builds, buys and maintains the Navy's ships and submarines and their combat systems.