A deadly rampage by suspected gunman Aaron Alexis at the Washington Navy Yard Monday morning left 13 dead. Aaron Alexis, a 34-year-old veteran who, according to NBC, obtained the assault rifle he used from a gun safe on the naval base, was killed in a shootout with police. He had been an hourly employee of a subcontractor of Hewlett-Packard called The Experts. Despite initial rumors of additional suspects, authorities are “comfortable” that Alexis worked alone. As of Monday night, 2,000 civilians were still being held at the Navy Yard, as investigators worked to interview each one before releasing them. D.C. officials stated at a press conference Monday evening that those killed ranged in age from 46 to 73.