UPDATED: 'At Least' 12 Dead in Mass Shooting at Washington Navy Yard; Shooter Killed; More May be on Loose

By Drew Hansen

At least one gunman opened fire Monday at the Washington Navy Yard, killing at least 11 people, injuring others and shutting down the capital's airport, roads, schools and parts of its subway system while a massive manhunt continued for two other possible shooters.

• LIVE UPDATES OF MASS SHOOTING AT NAVY YARD

At a 2:05 p.m. update, Lanier said the number of dead was "at least" 12, including the gunman. There was no known motive, she said. 

One witness, U.S. Navy Cmdr. Tim Jirus, said he was talking to a man three feet away when shots rang out and the man fell to the ground, shot in the head.

"I may be calm now, but I guarantee when I was running, I wasn't looking back," he told reporters. "I was running for my life."

At least one shooter had been pinned down between two floors on a base building in a standoff with police, according to The Washington Post. Unclear was whether the shooter who was killed was the same as the one who had been pinned.

• Navy Commander Witnesses Man Get Shot: 'I Was Running For My Life'

The Navy Yard is a large complex in Southeast Washington where about 3,000 civilians and military personnel report each day from homes in the District and large swaths of Virginia and Maryland.

President Obama, in remarks at the White House, said military members and civilians were targeted.

"They know the dangers of serving abroad," the president said, "but today they faced the unimaginable violence they wouldn't have expected at home." 

The U.S. Navy confirmed shots were fired around 8:20 a.m. at the Naval Sea Systems Command Headquarters building. All personnel remain under a “shelter in place” order as the incident unfolds.

Area resident Ty Phillips called the shootings "strange" and "wild." 

"A lot of people can't believe it around here," he told Patch. "It makes us not feel safe. Now people are going to probably be scared to go to work."

All morning and into lunchtime Monday, low-flying helicopters fluttered above, the sound mixed with police sirens and the spouting water at Canal Park. The choppers were flying low enough to read the letters on their tails. K-9 units were rushing about and a sea of red and blue lights flickered across the area.
 
One DC Metropolitan police officer and two civilians have been taken to the Washington Hospital Center, and officials have been told to expect more. 

"Their chances for survival are very good," Dr. Janis Orlowski, the hospital's chief operating officer and chief medical officer, said at a press conference.

• For information on family members call 202-433-6151. If you have any info on suspects or were a witness call 202-727-9099. 

The male police officer was shot in the legs. One woman had a gunshot wound to the shoulder, and another was shot in the head and hand, Orlowski said. All are in critical condition, however, "all of them are alert and speaking at this time."

"The young lady with the gunshot wound to the head we're just assessing right now," Orlowski said. 

A number of teams are standing by in the trauma bay, and the hospital has additional security this morning. Orlowski said that she was not aware of any other hospitals that have received patients. 

"We understand that there are individuals who will not be transported" because they have died, Orlowski said. She was unsure of the total number of deaths. 

The Navy Yard is well known to residents in the metro Washington area. It is an enclosed campus of mostly brick buildings located in the southeast quadrant of the district, just down the street from the Washington Nationals ballpark.

Staff reporting to the facility include engineers, secretaries, musicians with the Navy band, food service workers and many other employees.

The yard is a secure facility with no cameras or videos permitted in most buildings, including cell phones with camera capability. To enter the yard, pedestrians and vehicles and their owners must complete a security check with security staff.

The DC police said family members may reunite at Nationals Stadium Lot B, South Capitol and N St SE.

All flights were briefly held at Reagan National Airport by the Federal Aviation Administration as a result of the incident.

Police closed the 11th St Bridge as well as M St SE between 2nd and 4th streets SE due to the shooting, according to the paper. In addition, Metro Transit Police closed the New Jersey Avenue entrance at the Navy Yard station. The Half Street entrance remains open.

• LIVE UPDATES OF MASS SHOOTING AT NAVY YARD

• Understanding What the Washington Navy Yard Is and Who Works There
• Coast Guard Establishes Security Zone in Reaction To Navy Yard Shooting
• Navy Commander Witnesses Man Get Shot: 'I Was Running For My Life'

Jason Spencer, James Cullum, Sharon McLoone and Mary Stachyra Lopez contributed to this report.