Putnam had no details on a possible cause.Investigators would review information from a flight data recorder, and there was no indication the pilot was using alcohol or drugs, she said.

• 她没有关于这次爆炸发生原因的可能细节，她只说调查人员将对飞行记录资料进行调查，但并没有飞行员喝酒或吸毒的迹象。