try to pinpoint the cause of that deadly plane crash at an air race. t.j. has been telling you about it all morning long. the terrifying moment was witnessed by thousands of spectators. horrifying moment, it happened in an instant. at least three people and dozens more hurt when the plane slammed into the crowd. cnn s dan simmon in reno. dan, what more have we learned about how this happened? reporter: not much at this point, fred. i should point out that we ve already seen several videos like the one you just showed. we just learned there were actually 300 professionally credentialed photographers on site. so chances are we may be seeing a lot more video, a lot more pictures in terms of what happened right before the plane went down. what we know, according to the i witnesses. the plane pitched up and rolled and went down to the ground in a matter of seconds. we know that the pilot, said to be very experienced, 74 years old. been coming to the air show since 1975. so exper