BERLIN — Swiss police say all 20 people aboard an old-time propeller plane were killed when the aircraft crashed into a mountainside in southeast Switzerland.

The Swiss news website 20min.ch quoted police spokeswoman Anita Senti as saying that police now know all 20 people on the Junkers Ju-52 propeller plane died in the crash Saturday near the Alpine resort of Flims.

Officials said 11 men and nine women were killed, most from Switzerland but also a couple and their son from Austria.

The plane was operated by Ju-Air, a Swiss company that offers tours with vintage former Swiss military aircraft.