Investigators have released their preliminary report on the tour helicopter crash on the Big Island that injured six people in early June. The Bell 407 helicopter operated by Paradise Helicopters departed from Kona International Airport about 5 p.m. on June 8 for a sightseeing tour. It crashed about 30 minutes after takeoff near the southernmost tip of the island. In the preliminary report by the National Transportation Safety Board (NTSB), after about 30 minutes into the flight, the helicopter suddenly shook violently and then went into an uncontrolled spin. A passenger confirmed the spin and also told investigators she saw something fall off the helicopter but could not tell what it was. The chopper continued a rapid, spinning decent until it impacted the lave field and ended up on its left side.