DES MOINES, Iowa -- Federal aviation officials say a small plane that crashed in a corn field in northwest Iowa, killing all three Wisconsin men on board, last summer was low on fuel.

In a report last week, the National Transportation Safety Board said the single-engine Piper had two 25-gallon fuel tanks. After the crash, investigators drained 1 cup of fuel from the tank under the left wing and 2 1/2 cups from the tank under the right wing.

The plane crashed on June 23 near Sheldon in O'Brien County.

The three men on board -- Francis Allegretti, of Cambridge, Wis., Thomas Boos, of Fort Atkinson, Wis., and Malcolm McMillan, of Milton, Wis. -- were flying from Fort Atkinson to South Dakota on a hunting trip.