WICHITA, Kan. (AP) — Investigators say the pilot of a small plane that crashed into a flight training building at a Wichita airport last week declared an emergency about a minute after taking off, saying he had “lost the left engine.”

The National Transportation Safety Board said in a preliminary report Thursday that several witnesses reported the plane had its landing gear down before it hit the Flight Safety International building at Wichita Mid-Continent Airport. The pilot and three people in the building died. Six other people were injured, two of them seriously.

The left wing separated after hitting the building just below the roof line. The nose struck the roof and the plane slid for about 20 to 30 feet before the tail section came over the top, fol