At least four killed in Kansas as Beechcraft King Air crashes into building

A twin-engine Beechcraft King Air crashed into a building of Wichita Mid-Continent Airport shortly after take-off as it tried to return back to the airport abcnews.go.com. At the time of the accident, there were around 100 persons in the building and four have been reported killed – one of them was the pilot. Moreover, five others were injured.

Terrorism has been ruled out.
This building is the one that Flight Safety International uses to train pilots to fly Cessna planes.
Incidentally, nzherald.co.nz has added that Wichita Mid-Continent is located west of downtown Wichita and is a longtime aircraft manufacturing hub that is used by private aircraft and served by several airlines and their regional affiliates, including American, Southwest, Delta, United and Allegiant.

It is a reasonably busy airport and saw over 13,000 departures and about 1.4 million passengers last year, as revealed by the US Department of Transportation.