Shooter kills 12 at Washington Navy Yard (update) AP reports 1 shooter is dead

12:15 p.m.

As many as two gunmen opened fire Monday morning inside the Washington Navy Yard, killing at least 12 people in an attack on office workers at the heavily secured military installation in the heart of the nation’s capital, authorities said.

One gunman was dead, and police hunted for a second possible attacker who may have been disguised in a military-style uniform, police said.

Investigators said they had not established a motive for the shooting rampage, which unfolded less than four miles from the White House. As for whether it may have been a terrorist attack, Mayor Vincent Gray said: ‘‘We don’t have any reason to think that at this stage.’’

The FBI took charge of the investigation.

President Barack Obama mourned yet another mass shooting in the U.S. that he said took the lives of American patriots. Obama promised to make sure ‘‘whoever carried out this cowardly act is held responsible.’’

The area that was targeted, known as Building 197, was part of the headquarters for Naval Sea Systems Command, which buys, builds and maintains ships, submarines and combat systems. About 3,000 people work at the headquarters, many of them civilians.

Witnesses described a gunman opening fire from a fourth-floor overlook, aiming down on people in the first-floor cafeteria. Others said a gunman fired at them in a third-floor hallway. It was not clear whether the witnesses on different floors were describing the same gunman.

Around midday, police said they were searching for two men who may have taken part in the attack — one carrying a handgun and wearing a tan Navy-style uniform and a beret, the other armed with a long gun and wearing an olive-green uniform. Washington Police Chief Cathy Lanier said it was unclear if the men were members of the military.

But later in the day, police said in a tweet that the man in the tan uniform had been identified and was not involved in the shooting.

It was not immediately clear whether the number of dead included a gunman.

As emergency vehicles and law enforcement officers flooded streets around the complex, a helicopter hovered overhead, nearby schools were locked down and airplanes at nearby Reagan National Airport were grounded so they would not interfere with law-enforcement choppers.

A short distance away, security was beefed up at the Capitol and other federal buildings, but officials said there was no known threat.

Todd Brundidge, an executive assistant with Navy Sea Systems Command, said he and other co-workers encountered a gunman in a long hallway on the third floor. The gunman was wearing all blue, he said.

‘‘He just turned and started firing,’’ Brundidge said.

Terrie Durham, an executive assistant with the same agency, said she also saw the gunman firing toward her and Brundidge.

‘‘He aimed high and missed,’’ she said. ‘‘He said nothing. As soon as I realized he was shooting, we just said, ‘Get out of the building.’’’

Rick Mason, a civilian program-management analyst for the Navy who works on the fourth floor of the building, said a gunman was firing from the overlook in the hallway outside his office.

Shortly after the gunfire, Mason said, someone on an overhead speaker told workers to seek shelter and later to head for the gates at the complex.

Patricia Ward, a logistics-management specialist, said she was in the cafeteria getting breakfast.

‘‘It was three gunshots straight in a row — pop, pop, pop. Three seconds later, it was pop, pop, pop, pop, pop, so it was like about a total of seven gunshots, and we just started running,’’ Ward said.

Ward said security officers started directing people out of the building with guns drawn.

One person died at George Washington University Hospital of a single gunshot wound to the left temple, said Dr. Babak Sarani, director of trauma and acute care surgery. A police officer and two civilian women were in critical condition at Washington Hospital Center, said Janis Orlowski, the hospital’s chief operating officer.

Orlowski said the police officer was in the operating room with gunshot wounds to the legs. The police chief said the officer was wounded when he engaged the shooter who later died.

One woman at the hospital had a gunshot wound to the shoulder. The other had gunshot wounds to the head and hand.

Adm. Jonathan Greenert, chief of naval operations, was at the base at the time the shooting began but was moved unharmed to a nearby military installation

Anxious relatives and friends of those who work at the complex waited to hear from loved ones.

Tech Sgt. David Reyes, who works at Andrews Air Force Base, said he was waiting to pick up his wife, Dina, who was under lockdown in a building next to where the shooting happened. She sent him a text message about being on lockdown.

‘‘They are under lockdown because they just don’t know,’’ Reyes said. ‘‘They have to check every building in there, and they have to check every room and just, of course, a lot of rooms and a lot of buildings.’’

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. Only security personnel were allowed to be armed on the grounds.

Mason, the program management analyst for the Navy, said there are multiple levels of security to reach his office. Everyone must show a building ID to get through a main gate, and at the building entrance, everyone must swipe a badge to pass through either a door or gate, depending on the entrance.

That ‘‘makes me think it might have been someone who works here,’’ he said.

The Navy Yard has three gates, according to its website. One is open around the clock and must be used by visitors. A second gate is only for military and civilian Defense Department employees. The third gate is for bus traffic.

The Navy Yard is part of a fast-growing neighborhood on the banks of the Anacostia River in southeast Washington, blocks from the Nationals Park baseball stadium.

10:15 a.m.

Officials continue to search for “potentially” two additional gunmen in a shooting rampage at the Washington Navy Yard, according to D.C. Police Chief Cathy Lanier.

“We potentially have two other shooters that we have not located,” Lanier said in a brief news conference outside the gates to the sprawling base.

Lanier confirmed that one shooter had been killed, but said that police were still searching for a white male last seen about 8:35 Monday morning wearing khaki military-style clothes and a beret and carrying a handgun, and a black male about 50 years old, wearing a military-style olive, drab uniform who may have been carrying a rifle.

9:15 a.m.

The Associated Press and multiple news agencies are reporting that a shooter was contained, and then killed at the Washington Navy Yard.

WASHINGTON – At least one shooter has died at the Washington Navy Yard, where several people were killed and as many as 10 were wounded, officials told The Associated Press.

A federal law enforcement official and a Defence Department official spoke on condition of anonymity because they were not authorized to discuss the ongoing investigation.

Two other officials have told AP that they are looking into the possibility of a second shooter at the Navy Yard.

One of the injured includes a law enforcement officer

8:35 a.m.

WASHINGTON (AP) — At least one gunman opened fire inside a building at the Washington Navy Yard on Monday morning, and officials said several people were killed and as many as 10 were wounded, including a law enforcement officer.

A shooter was “contained” but not yet in custody, according to a Defense Department official, who spoke on condition of anonymity because they were not authorized to discuss the matter publicly. Two other officials — one with the Defense Department and the other with law enforcement — said police were looking into the possibility of a second shooter.

Witnesses described a gunman opening fire from the fourth floor, aiming down on people in the first-floor cafeteria. Others said a gunman fired at them in a third-floor hallway.

As witnesses emerged from the building, a helicopter hovered over the building, schools were on lockdown and airplanes at nearby Reagan National Airport were briefly grounded. Less than 2 miles away, security was beefed up at the Capitol, but officials said there was no known threat there.

The exact number of people killed and the conditions of those wounded was not immediately known. About 3,000 people work at the Naval Sea Systems Command headquarters, which builds, buys and maintains the Navy’s ships and submarines and combat systems.

Todd Brundidge, an executive assistant with Navy Sea Systems Command, said he and other co-workers encountered a gunman in a long hallway of their building on the third floor. The gunman was wearing all blue, he said.

“He just turned and started firing,” Brundidge said.

Terrie Durham, an executive assistant with the same agency, said she also saw the gunman firing toward her and Brundridge.

“He aimed high and missed,” she said. “He said nothing. As soon as I realized he was shooting, we just said, ‘Get out of the building.’”

Rick Mason, a program management analyst who is a civilian with the U.S. Navy, said a gunman was shooting from a fourth floor overlook in the hallway outside his office. He said the gunman was aiming down at people in the building’s cafeteria on the first floor. Mason said he could hear the shots but could not see a gunman.

Shortly after the gunfire, Mason said someone on an overhead speaker told workers to seek shelter and later to head for the gates at the complex.

Patricia Ward, a logistics management specialist, said she was in the cafeteria and heard shots. They sounded like “pop, pop, pop,” she said. After a few seconds, there were more shots.

“Everybody just panicked at first,” she said. “It was just people running, running, running.”

Ward said security officers started directing people out of the building with guns drawn.

Police and federal agents from multiple law enforcement agencies responded. Ambulances were parked outside, streets in the area were closed and departures from Reagan National Airport were temporarily halted for security reasons.

Among the wounded was a D.C. police officer, according to a law enforcement official who spoke on the condition of anonymity because the person was not authorized to discuss an ongoing investigation.

A U.S. Park Police helicopter hovered over the building and appeared to drop a basket with a person onto the roof.

Officials at MedStar Washington Hospital Center said two shooting victims had been brought there.

District of Columbia schools officials said six schools and one administrative building in the vicinity of the Navy Yard were placed on lockdown. The action was taken out an abundance of caution, schools spokeswoman Melissa Salmanowitz said.

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.

The Navy Yard is part of a fast-growing neighborhood on the banks of the Anacostia River in southeast Washington, just blocks from Nationals Park and about 1 ½ miles southeast of the U.S. Capitol.

Associated Press writers Lolita C. Baldor, Stacy A. Anderson and Ben Nuckols in Washington contributed to this report.

7:45 a.m. PDT

A Defense Department official says at least four 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.

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 am (local time) 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.