(AP) — A preliminary federal report on a Kansas plane crash that killed a traveling California pastor and his pilot does not conclude what caused the aircraft to lummet to the ground 10 minutes after take-off.

The National Transportation Safety Board report released this week did note that pilots in the area at the time of the Oct. 18 crash indicated there was light to moderate icing conditions above 6,000 feet.

The 1975 Cessna Citation was carrying 72-year-old Ed Dufresne and his pilot, 49-year-old Mitchell Morgan, to a speaking engagement in Texas when it suddenly went into a nosedive and crashed near Derby.

The report says the flight left Mid-Continent airport in Wichita at 10:07 a.m. and went down at 10:17 a.m., destroying the plane on impact.