celine gounder, thank you so much. safety investigators have rushed to the scene of the crash on the scottsdale runway. kris van cleave is there and reports the probe into what happened may center on the planes landing gear. >> reporter: this dramatic video from monday afternoon will be at the center of a national transportation safety board investigation as it appears to show the left main landing gear collapsing, sending the plane veering off the runway before slamming into a parked gulfstream 200. team of five ntsb investigators is working to understand what went wrong. >> maintaining altitude. we just had an emergency. >> reporter: firefighters were on scene within a minute but the collision killed one person and two others were rushed to the hospital with critical injuries a third was transported with nonlife-threatening injuries. another person was evaluated at the scene but walked away. >> our thoughts and prayers for the individuals on the aircraft. it's certainly a tragedy that occurred. >> reporter: the leer