PHOENIX — A man and a woman are hospitalized in serious condition after the crash of a small plane in a desert area of northwest Phoenix.

Authorities say the plane went down around 10 a.m. Wednesday about 4 miles west of Deer Valley Airport.

The single-engine Rockwell Commander crashed into a shade structure at a miniature railroading club that provides train rides for the public on weekends.

The aircraft was heavily damaged, with the propeller ripped off and heavily bent wings. There was no sign of a fire.

Federal Aviation Administration officials say it’s not yet known why the plane crashed.

The names of the injured weren’t immediately released.

Records show the plane is registered to Sho Co Kids LLC, but a telephone number for the Mesa business couldn’t be immediately found.