Investigators who combed Scouring through the debris were confronted Confronting_problem with unusual evidence : the toilet and baggage compartment had been smashed Destroying into fragments .

Investigators subsequently found Know evidence of suitcases with explosives and flammable material , including three undetonated bombs .

Investigators with the Civil Aeronautics Board determined Deciding that the cable physically connecting Connect the first officer 's control wheel to the aileron boost unit had disconnected .

Investigators determined Deciding the cause Causation of the accident Catastrophe to be failure of the autopilot system and poor cockpit crew performance .

Investigators believe Know the two plots were linked Connect , and that those responsible were aiming Aiming for a double aircraft bombing Terrorism .

Investigators with the Civil Aeronautics Authority , a predecessor organization of both the FAA and the NTSB , determined Deciding that both vertical fins and both rudders were missing from the twin-tailed aircraft .

Investigators believe the saboteurs took Conquering several nights to cut through the rail , which was remote enough that no one would see Perception_active them at work Employment .

Investigators also found Know that the deicing procedures at LaGuardia were substandard .

Investigators also found Know evidence Statement that the takeoff may have been performed Hold with the elevator trim tab still set Being_in_operation for landing .

Investigators found Know that the forged documents used Using by the perpetrators of the attack Terrorism were facilitated Preventing_or_letting by a man with ties to Hezbollah .

Investigators with the United States Department of Commerce 's Civil Aeronautics Authority ( CAA ) , a predecessor organization to both the FAA and the NTSB , determined Deciding that an intense fire had developed Coming_to_be in the cockpit shortly after the aircraft had departed Departing the airport .