The National Transportation Safety Board (NTSB) issued a preliminary report Wednesday detailing its probe of a Delta Air Lines flight that experienced "severe" turbulence in late July, sending more than a dozen people to the hospital.

The safety board said Delta Flight 56, en route from Salt Lake City to Amsterdam, encountered the significant turbulence on July 30 while flying over Creston, Wyo. After injuries were reported, the flight crew diverted to Minneapolis-St. Paul International Airport, according to officials.

“After landing, 24 of the 246 passengers were evaluated by emergency medical technicians, with 18 transported to local hospitals for additional assessment; information regarding their conditions is currently unavailable," the report reads.

During the flight, NTSB noted, t

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