Witnesses described seeing a plume of smoke as the four-seat Robinson 44 craft plunged to the ground and appeared to clip the roof of one home before skidding along the ground at an intersection and smashing into another house.
A nearby resident told the local ABC7 news channel it "sounded like a train coming through." Upon arriving at the scene she said she "saw one man out, I'm not sure if he fell out, and there was body parts."
"I put my hand on the back of the helicopter and started praying over them. Because I knew at that point there weren't any survivors," she added.
The woman said the residents of the home that was struck were there, but were in another part of the property and were unharmed.
Details of the moments leading to the crash and the cause were not immediately clear but Chip Duncan, the fire chief in Newport Beach, confirmed three people had died and two others had been taken to hospital with unknown injuries.
The Newport Beach Police Department said on its Twitter account there were four passengers on board, adding: "It does not appear that any persons on the ground were involved."
The helicopter is owned by Revolution Aviation, which says on its website it has been operating since the 1960s, offering pilot training and sightseeing trips. The website boasts a 100 percent safety record.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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