Shots were fired Monday inside the U.S. Navy Yard, killing 12 people and the shooter, D.C. Mayor Vincent Gray said.
The incident began about 8:20 a.m. ET when several shots were fired inside the Naval Sea Systems Command headquarters in the southeast portion of the capital.
The injured included a Washington, D.C., police officer who has been hospitalized and another law officer not affiliated with the city force, a police spokesman said.
The dead suspect has been identified as Aaron Alexis, a 34-year-old military contractor from Texas, the FBI said. One other gunman may be on the loose, police said.
10:47 p.m. ET -- Police released the names and ages of seven of the 12 people killed in the shooting. None of the seven was military personnel:
-- Michael Arnold, 59
-- Sylvia Frasier, 53
-- Kathy Gaarde, 62
-- John Roger Johnson, 73
-- Frank Kohler, 50
-- Kenneth Bernard Proctor, 46
-- Vishnu Pandit, 61.
10:40 p.m. ET -- Alexis had access to the Navy Yard because of his contracting work, and he used a valid pass to enter the yard, said Valerie Parlave, assistant director in charge of the Washington FBI field office.
10:39 p.m. ET -- Besides the 13 people who were killed, eight people were injured in Monday morning's shooting, 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.
10:38 p.m. ET -- Washington police are confident that only one person was involved in Monday morning's shooting, 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 Aaron Alexis, 34, was killed after an encounter with security.
10:37 p.m. ET --The ages of those who were killed in Monday morning's shooting at the Washington Navy Yard range from 46 to 73, D.C. Mayor Vincent Gray said. The dead suspect, Aaron Alexis, was 34.
9:37 p.m. ET -- One of the weapons that Alexis is accused of using was purchased recently at a store in northern Virginia, an FBI source with firsthand knowledge of the investigation told CNN's Pamela Brown.
8:43 p.m. ET -- The Washington police officer who had surgery after being shot in his legs is "alert, he's talkative, and he's doing very well," said Janis Orlowski, the chief medical officer at Medstar Washington Hospital Center.
Earlier, CNN's Chris Lawrence reported that doctors will begin to determine on Tuesday whether he will be able to keep the legs.