Sep 25, 2013 — The FBI released its preliminary findings in its investigation of the Navy Yard shootings that left 13 people dead including the shooter. Aaron Alexis said he committed the massacre because he was being attacked by electromagnetic waves.
Sep 19, 2013 — USIS, which processes thousands of background checks a year for the U.S., is being investigated for "systemic failure" to adequately vet employees and contractors. The company would not comment on the specifics of the Alexis investigation.
Sep 19, 2013 — In his first remarks to reporters since taking office this month, FBI Director Jim Comey addressed security concerns following the Navy Yard shootings that left 13 people dead. He also talked about sequestration and leaks on government surveillance programs.
Sep 19, 2013 — Among the developments being reported Thursday is word that Capitol Hill Police are investigating whether one of their SWAT teams was told to "stand down" even though its members were near the scene.
Sep 18, 2013 — In a statement she read to the news media at midday Wednesday, Cathleen Alexis says she does not know why her son killed 12 people on Monday at the Washington Navy Yard. Meanwhile, more is coming out about Aaron Alexis's actions in the days leading up to the attack.
Sep 17, 2013 — Friends and family are shocked that he's said to have killed 12 people Monday at the Washington Navy Yard. Was Alexis a gentle man who studied Buddhism? Or a violent man prone to outbursts? The suspected killer's past points to both.
Sep 17, 2013 — Investigators say they're confident only one gunman was responsible for the deaths of 12 people and wounding of others. The man who authorities say carried out the attack, 34-year-old Aaron Alexis, is also dead after a gun battle with police.
Sep 16, 2013 — The 34-year-old, who reportedly died at the scene, had been less-than-honorably discharged from the U.S. Navy Reserve for "misconduct issues" in 2011.