The National Transportation Safety Board (NTSB) has released the preliminary investigation report on the February 17 incident of United Airlines Flight 1676, flying from Denver-to-Billings, which suddenly started to jolt, injuring many passengers.
According to the report, the airplane was in cruise flying mode at an altitude of 34,000 feet, when it ran into extreme clear air turbulence and resulted in several injuries. The report further elaborates that among 114 passengers and flight crew, 2 were seriously injured while 9 were hospitalized with minor injuries.
The Boeing 737-700 was also damaged and was taken to United maintenance facility in Houston.