It crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in the east of the country on Saturday at an altitude of 2,540 metres on the mountain's western flank, Senti said.
The crash occurred above the Swiss Alpine resort of Flims, an area popular with hikers and skiers.
Ju-Air, which offers flights from Junkers Ju-52 planes, said one of its vehicles was involved in the incident.
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Police said Sunday they have now determined that all 20 people on board the plane, including its three crew members, died.
A small plane crashed in the Swiss Alps, killing 20 people, according to local officials.
In another crash on Saturday, a family of four including two young children were killed when a small plane came down in central Switzerland.
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Ju-Air started operating flights with the old-timers in 1983, and the plane that crashed - with the registration HB-HOT - had been in service with the company since 1985.
Andreas Tobler, Grisons canton chief of police said there was "no longer any hope of finding anyone alive".
On its website, JU-Air mentions one past accident, in 1987, at the Koblenz airport in Germany in which no one was hurt.
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"One can ascertain that the aircraft hit the ground almost vertically at high speed", Daniel Knecht, who heads the aviation division of the Swiss Transportation Safety Investigation Board, said. It has suspended all flights until further notice.