51.   Investigators determined that Silber had not broken any laws.

52.   Investigators determined that the crash had been caused by vortex ring state, an aerodynamic occurrence in which a rotorcraft rapidly descending into its own turbulent wake loses lift.

53.   Investigators determined that the pickup blaze was set by an arsonist, but have yet to determine how the accelerant ignited.

54.   Investigators determined that the small bomb had been planted by a Lebanese terrorist.

55.   Investigators determined the cause to be charcoal that had been placed underneath the car, Herrera said.

56.   Investigators determined this week that Nguyen was not infected at either her Bronx apartment or the Manhattan hospital where she worked.

57.   Investigators have determined that Smith was killed by the fire, not the crash, and they found traces of an accelerant, possibly gasoline, on her clothing.

58.   Investigators have determined that such an aileron shift caused the plane at Roselawn to flip and crash.

59.   Investigators have determined that the burning fuel apparently undermined what is known as a transfer truss.

60.   Investigators later determined that a seal called an O-ring had collapsed, partly due to the cold weather.