Officials believe the pilot of a small plane that crashed into a flight-training building at Wichita’s airport is among the four people who were killed.

Wichita Fire Chief Ronald Blackwell confirmed that three of the dead were inside the building when the plane crashed into it Thursday at the Mid-Continent Airport. Blackwell said the fourth victim was on the roof of the building and is believed to be the pilot.

All others who were in the building are accounted for.

Identities of the dead haven’t been released.

Authorities say the plane lost power just after takeoff and tried to return to the airport when it crashed into the building.

Five others were injured in the crash, and one is in serious condition at a hospital.