A day after police say a 34-year-old civilian contractor and ex-Navy reservist killed 12 people at the Washington Navy Yard, questions are being asked about how a man with a troubled service record and signs of mental instability had clearance to be on base.
The victims of the Navy Yard shootings that brought panic and tragedy to a corner of Washington, D.C., on Monday morning are in many people's thoughts as their names and other information are released. We'll collect what we know about the victims here.
-- Investigators now do not think there was a second shooter, D.C. Police Chief Cathy Lanier said late Monday evening. Throughout Monday, authorities had run down witness reports and other evidence indicating there might have been additional gunmen.
Aaron Alexis, the 34-year-old man believed responsible for Monday's shooting rampage that killed 12 people at the Washington Navy Yard, was a former full-time Navy reservist who had obtained a concealed-carry permit in Texas and was arrested three years ago for illegally discharging a weapon.