A small plane crashed in the Swiss Alps, killing 20 people, according to local officials.
The plane, which was on a flight between Locarno in southern Switzerland, to Dübendorf, a suburb of Zurich, was found about 2,540 meters (8,333 feet) above sea level.
"The JU-Air team is deeply saddened and thinks of the passengers, the crew and families and friends of the victims", read a statement on its website.
Photos released by Graubuenden canton (state) police showed the crumpled wreckage of the plane lying on the mountain, with only the upside-down tail more or less intact.
The company "still can not explain" the incident, they said, pledging to support the official investigation.
Among those killed were 17 people from Switzerland and a three-person family from Austria.
Katherine Lam is a breaking and trending news digital producer for Fox News.
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The aircraft was a Junker JU52 HB-HOT plane, built in Germany in 1939 and now a collectors' item. They also expect the investigation into the cause of the crash to be "relatively complex".
Ju-Air offers "adventure flights" for people wanting to experience Switzerland's landscape from vintage planes.
The cause of the crash is not known.
He said hot weather conditions did not contribute to the crash and that the aircraft fell nearly vertically out of the sky at relatively high speed.
Wreckage of JU-Air plane involved in crash in the Swiss Alps.
He said officials have essentially ruled out a collision with another aircraft or hitting an obstacle such as a wire.
Almost 5,000 Ju-52 planes were manufactured between 1932 and 1952.
The aircraft have three engines, one on the nose and one on each wing. The airline suspended flights until further notice.