April 19, 1995
Approximately 200 FBI agents and specialists were working on the crime. About 75 agents from the ATF and 45 U. S. Marshals were assisting in the investigation. Teams spent several weeks sifting for evidence throughout the crime scene.
In Chapter 9 of the Memorial Museum, visitors view the methods investigators used and through interactive exhibits are able to follow the investigation as it progressed.
McVeigh was arrested during a routine traffic stop by Oklahoma Highway Patrol Trooper Charlie Hanger. This incident, more than any other, showed how well the system works, with an ordinary officer doing his job extraordinarily well. Hanger stopped the yellow 1977 Mercury Marquis for failure to display a license plate. McVeigh was charged with unlawfully carrying a weapon and transporting a loaded firearm.