LONDON -- Three people have been killed and one person seriously injured when a helicopter crashed Monday during a flight lesson on the Isle of Wight, off the south coast of England. The Robinson R44 II helicopter had a pilot and three passengers onboard when it crashed just before 9:30 a.m., authorities said. The operator, Northumbria Helicopters, said its aircraft was involved in a crash during a flight lesson. The seriously injured survivor was airlifted to the trauma center at University Hospital Southampton. Eyewitness Leigh Goldsmith was driving when she saw the helicopter spiral down into a hedge, she told the Isle of Wight County Press. The U.K.'s Air Accidents Investigation Branch said it is sending a team of inspectors to the scene. The cause of the crash is not known.

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