A fuel leak and several improperly installed parts were found inside the engine of an American Airlines plane that caught fire after the plane landed in Denver in March, according to a new report released Thursday.

Related video above: See footage of crews responding to the fire in March

The National Transportation Safety Board said one part inside the right engine of the Boeing 737-800 was loose and had been installed in an incorrect direction and that fuel was leaking from the fitting of another part that was incorrectly fastened.

The preliminary findings don't identify the cause of the fire because the NTSB won't reach that conclusion until after it completes its investigation sometime next year.

But former NTSB and FAA investigator Jeff Guzzetti said the problems investigators

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