“The reported circumstances were that shortly after lift-off, the helicopter experienced violent shaking, and it impacted the ground on its left side.
“The helicopter was extensively damaged.”
The Civil Aviation Authority had been advised of a helicopter incident involving a privately-operated aircraft with three people on board, including the pilot,  a CAA spokeswoman said. 
Two of the injured were driven to Whakatāne Hospital by ambulance in moderate conditions, and the third was airlifted to Tauranga Hospital in a serious condition. 
“CAA has notified the Transport Accident Investigation Commission and has deployed a staff member to the scene to assist with initial coordination.”
The spokeswoman said there was no risk to the wider public and further updates would be provided when appropriate.