WASHINGTON (AP) - D.C. Police Chief Cathy Lanier says authorities believe there was only a lone gunman responsible for the Navy Yard shooting rampage that left 13 people dead.
Authorities had earlier said they were searching for a possible second suspect.
Mayor Vincent Gray says the 12 shooting victims range in age from 46 to 73 years old. The gunman, identified as 34-year-old Aaron Alexis, was also killed.
Gray said at a news conference late Monday night that they are still notifying the families of about half of the 12 people who were killed.
The FBI says the gunman used a valid pass to get on to the Navy Yard.
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.
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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.
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Police say at least 12 people have died in the shootings at the Washington Navy Yard.
D.C. Police Chief Cathy Lanier said during a news conference Monday that 12 people were confirmed dead.
Lanier says people are being told to stay in their homes and out of the area as authorities search for two other possible suspects. One of the shooters has died.
The police chief says officers are searching for two other people with firearms wearing military-style uniforms.
She says there is no indication of a possible motive at this time.
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Police in Washington, D.C., are looking for two other possible gunmen, after a shooting today at the Washington Navy Yard that left six people dead.
Officials say at least four others were wounded, including a law enforcement officer. 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.
Authorities say they are looking for two additional suspects in a shooting rampage today 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.
As many as 10 were wounded.
This is a developing story and we will continue to update it as new information becomes available.
Two Navy officials say at least six people have died in a shooting at the Washington Navy Yard.
The officials spoke on condition of anonymity on Monday because they were not authorized to discuss the situation publicly.
A Defense Department official and a federal law enforcement official have said a shooter had died, though it was not immediately clear how.
Police are also looking into the possibility of a second shooter.
As many as 10 were wounded.
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.
A Defense Department official says several people have been killed and as many as 10 have been wounded in a shooting at the Washington Navy Yard.
The official spoke on condition of anonymity Monday because the official was not authorized to discuss the matter publicly.
The official also says the shooter is "contained" but not yet in custody.
Earlier in the day, the U.S. Navy said it was searching for an active shooter at the Naval Sea Systems Command headquarters, where about 3,000 people work.
The exact number of people killed and the conditions of those wounded was not immediately known.
The Navy says several people have been injured in a shooting at a building at the Washington Navy Yard. Authorities are still looking for the shooter.
Officials say the shots were fired at around 8:20 this morning at the Naval Sea Systems Command headquarters, where about 3,000 people work.
Police and federal agents are on the scene. Ambulances are parked outside the building, and streets in the area are closed. Flights at Reagan National Airport have been 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.
D.C. police and the FBI say there's a report of a shooter inside a military building at the Washington Navy Yard.
Police are responding to reports of shots fired, and an FBI spokeswoman says there's at least one victim.
The U.S. Navy also said on Twitter that they're looking for a gunman. They say three shots were fired inside their Naval Sea Systems Command headquarters.
The Washington Navy Yard says on its website that it's the Navy's oldest shore establishment. It is home to the chief of Naval Operations and is also headquarters for the Naval Historical Center and numerous naval commands.
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