Besides the 13 people who were killed, eight people were injured in Monday morning's shooting at the Washington Navy Yard, Washington Mayor Vincent Gray told reporters Monday night. Three of those were injured by gunfire, and the others had other types of injuries, such as contusions and chest pain. Earlier Monday night, Navy Vice Adm. William D. French said 14 people were injured. The 13 dead include suspect Aaron Alexis.
Washington police are confident that only one person was involved in Monday morning's shooting at the Washington Navy Yard, and they are lifting a shelter-in-place order for residents who live nearby, Police Chief Cathy Lanier said Monday night. Authorities have said suspect Alexis, 34, was killed after an encounter with security.
The ages of those who were killed in Monday morning's shooting at the Washington Navy Yard range from 46 to 73, Gray said.
Witness: People pushed their way out of building
The violence started unfolding at 8:20 a.m. when several shots were fired inside the southeast Washington facility.
Police spokesman Chris Kelly soon described a suspect as an adult male, about 6 feet tall with a bald head and medium complexion, dressed in a black top and black jeans.
He was armed with an AR-15, which is a semi-automatic rifle; another rifle and a semi-automatic Glock handgun, according to a law enforcement official.
Two witnesses told CNN affiliate WJLA-TV that they heard a fire alarm go off in the building where they worked, then saw a man with a rifle down the hallway as they exited the building.
"He aimed the gun and fired our way," Todd Brundidge told WJLA.
People frantically ran down stairs to get out of the building, Brundidge said.
"They were pushing. They were shoving. People were falling down," he told WJLA. "As we came outside, people were climbing the wall trying to get over the wall to get out. .... It was just crazy."
The injured included a Washington police officer who has been hospitalized, and a base security guard officer, said Metropolitan Police Department spokeswoman Saray Leon.
Three people, including the D.C. police officer, were admitted to MedStar Washington Hospital Center with multiple gunshot wounds. They are expected to survive, chief medical officer Janis Orlowski told reporters.
One person was pronounced dead at George Washington University Hospital, according to Dr. Babak Sarani, chief of trauma and acute care there.
Details emerge about suspect
As authorities investigated the deadly shooting, across the country details began to emerge about the suspect.
The FBI said it identified Alexis using fingerprints and ID.
He was in the Navy's ready reserve, Navy Secretary Ray Mabus told CNN. In the past, he was an enlisted petty officer working on electrical systems. He was discharged from the Navy following a "pattern of misconduct," a U.S. defense official said. The military is reviewing his files.
The suspected shooter had an active ID and entered the base legally, according to a federal law enforcement official.
Outside Fort Worth, Texas, friend Michael Ritrovato said Alexis had recently been frustrated with the civilian contractor about a payment issue. But Ritrovato said his friend never showed signs of aggressiveness or violence, though he played a lot of shooting video games online.
"It's incredible that this is all happening, because he was a very good-natured guy," Ritrovato said. "It seemed like he wanted to get more out of life."
In Seattle, police said they arrested Alexis in 2004 for shooting out the tires of another man's vehicle in what Alexis later told detectives was an anger-fueled "blackout."
SWAT teams swarm area
Meanwhile, at the Navy yard, helicopters hovered overhead. In one chopper, there appeared to be a police sniper peering out, with a scope at the ready.