Parts of the nation’s capital were put on lockdown in the day after the shooting on the edge of Capitol Hill as the police sought two other armed suspects spotted by video cameras. But by Monday evening, federal authorities said they believed the shooting was the act of a lone gunman.
At Washington’s Navy Yard, the chaos started just after 8 a.m. Civilian employees described a scene of confusion as shots erupted through the hallways of the Naval Sea Systems Command headquarters, on the banks of the Anacostia River a few miles from the White House and about a half-mile from the Capitol.
“I heard three gunshots, pow, pow, pow, straight in a row,” said Patricia Ward, a logistics management specialist from Woodbridge, Va., who was in the cafeteria on the first floor when the shooting started. “About three seconds later, there were four more gunshots, and all of the people in the cafeteria were panicking, trying to figure out which way we were going to run out.”
Police officers who swarmed the military facility exchanged fire with a gunman later identified by the federal authorities as Aaron Alexis, 34, a former naval reservist from Fort Worth, Tex. Police officers shot and killed Mr. Alexis, law enforcement officials said, but not before a dozen people were killed and several others, including a police officer, were injured and taken to local hospitals.
Officials said Mr. Alexis was able to drive onto the base and began firing as he approached Building 197, shooting an officer. Once inside, Mr. Alexis made his way to a floor overlooking an atrium and took aim at the employees eating breakfast below.
“He was shooting down from above the people,” one law enforcement official said. “That is where he does most of his damage.”
A police officer underwent several hours of surgery for gunshot wounds to his legs. A second victim suffered a gunshot wound to her shoulder. A bullet grazed a third victim’s head but did not penetrate her skull, according to doctors at MedStar Washington Hospital Center.
Three weapons were found on Mr. Alexis: an AR-15 assault rifle, a shotgun and a semiautomatic pistol, a senior law enforcement officer said. Officials said they were still searching for a motive as they asked the public for help by posting pictures of Mr. Alexis on the F.B.I. Web site.
Navy officials said late Monday that Mr. Alexis had worked as a contractor in information technology. A spokesman for Hewlett-Packard said Mr. Alexis had been an employee of a company called The Experts, a subcontractor on an HP Enterprise Services contract. Navy officials said Mr. Alexis was discharged in 2011 after exhibiting a “pattern of misbehavior,” which officials declined to detail. Because of the lockdown at the Navy Yard, the officials said they were still unable to search databases to determine his current employment status, or whether he had been fired.
The police in Seattle, where Mr. Alexis once lived, said Monday that they had arrested him in 2004 for shooting the tires of another man’s vehicle in what Mr. Alexis later described to detectives as an anger-fueled “blackout.”
Eleanor Holmes Norton, the Congressional representative for the District of Columbia, called the episode “an attack on our city.”
“It’s an attack on our country,” she added.
Mayor Vincent C. Gray called it a “long, tragic day.” President Obama praised the victims of the shooting as patriots.
The tension in the city was heightened for much of the day as the city’s police said they were still unsure whether Mr. Alexis had acted alone. Officials said surveillance video of people fleeing the scene of the shooting showed two armed men dressed in different military uniforms and wielding guns. For hours, the police said they believed that there might have been three gunmen and that two of them were on the loose in the city.
Reporting was contributed by Abby Goodnough, Emmarie Huetteman and Thom Shanker from Washington, and William K. Rashbaum from New York.
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