The company "still can not explain" the incident, they said, pledging to support the official investigation. Most were from Switzerland but also a couple and their son from Austria.
JU-52 HB-HOT aircraft does not have a crash-resistant cockpit voice and data recorders because it is an older model.
Police said that the aircraft had burned and officials haven't yet been able to ascertain the exact number and identity of those who died.
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.
He also said there is no indication of foul play or that the aircraft lost parts or broke up before the crash.
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The fire, which is almost twice the size of Sacramento, was only 35 per cent contained after more than a week. Shasta County Sheriff Tom Bosenko said all missing people reported to his office had been accounted for.
Authorities are investigating what caused the deadly crash.
According to the SwissInfo website, citing local police, the plane went down near the Piz Segnas mountain on the afternoon of August 4 at an altitude of 8,330 feet.
The plane had been returning from Locarno near Switzerland's southern border.
The airspace above the crash site was closed by the Federal Office for Civil Aviation and access to popular hiking trails in the surrounding area was blocked.
JU-Air says it runs a small fleet of four Junker planes, all built in 1939, which are for hire.
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However, Lovato has yet to release a statement since her apparent overdose . News that Lovato is "grateful to be alive" following the overdose.
The aircraft was in possession of JU-Air, a company with links to the Swiss Air Force.
Chief executive and co-founder Kurt Waldmeier said the planes "are flown exclusively by very experienced professional pilots, and strictly checked and maintained by our own technicians".
According to JU-AIR, a Ju-52 airplane, which seats 17 passengers along with two pilots, had crashed.
The aircraft have three engines, one on the nose and one on each wing.
The company, which operates two other Ju-52s, suspended flights until further notice after the crash.
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The EU mission said this is a preliminary statement and more is expected on how the election results are handled and announced. The ruling ZANU-PF party won a majority of seats in Parliament, the electoral commission said.