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

A subsequent investigation Criminal_investigation by the Chinese authorities found Know that the plant had been lacking many major safety features and was severely below regulation benchmarks , with the direct cause Causation of the accident Catastrophe being attributed Causation to inappropriate use Using of substandard equipment .

Authorities , in response Communication to local residents ' angry criticism Judgment_communication , admitted that the emergency response Communication to the accident Catastrophe was substandard .