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WILLOUGHBY HILLS -- A National Transportation Safety Board spokesman says preliminary findings into what caused the fatal plane crash that killed four Case Western Reserve University students will likely come next week.

Peter Knudson says investigators are first reviewing the crash wreckage, surroundings and conditions late Monday night when the plane crashed.

They will review the plane's maintenance history, pilot William Felten's training and flight record, and questions surrounding possible excess weight and balance issues on the flight.

A toxicology report on Felten will also be part of the process.

An NTSB investigator from Washington, supported by other experts from regional offices, makes up the investigative team.

A complete, exhaustive and detailed final investigation will take much longer.

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