GRAND FORKS, N.D. —  The dean of the University of North Dakota aerospace school says the investigation into the crash of a UND airplane last October suggests the plane went down after colliding with geese.

Twenty-year-old student Adam Ostapenko of Duluth, Minnesota, and 22-year-old instructor Annette Klosterman of Seattle died when the twin-engine Piper Seminole crashed in a swampy area in central Minnesota on October 23.

The two were on a routine training flight from St. Paul, Minnesota, to Grand Forks.

UND aerospace dean Bruce Smith says there was a large dent on the plane's left wing and another dent on the plane's tail section, and that goose remains were found.

The National Transportation Safety Board has not yet released an official cause of the crash.