Dutch National Archives
The FBI has released new photos showing Navy Yard gunman Aaron Alexis on the day of the shooting.
Aaron Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate on Sept. 16, 2013.
On the morning of April 19, 1995 Timothy McVeigh killed 168 people during the Oklahoma City bombing. Find out more about that tragedy here.