Four people have died after the helicopter they were riding in plummeted from the sky and crashed into a field.

There were no survivors of the crash, which happened on Sunday in a remote area of Northern California.

According to the Colusa County Sheriff’s Department, the Robinson R66 chopper crashed at 1:15pm about 65 mile northwest of Sacramento.

The Federal Aviation Administration has said it is investigating the cause of the tragedy, a spokesperson said in a statement.

It was first reported by a Cal Fire engine that was driving through the area, FOX 40 reports.

Deputies and Sacramento River Fire officers are said to have found the four passengers still inside the helicopter after it crashed. They were all declared dead at the scene and have yet be be formally named, according to KCRA.

Walt Seaver, who owns the tomato farm where the helicopter crashed, said he didn’t see any smoke as the helicopter came down.

The cause of the crash is currently unknown, and the FAA and the National Transportation Safety Board will work together to find out exactly what happened in the lead up to the crash. 

‘Once on scene, investigators will begin the process of documenting the scene and examining the aircraft’, Jennifer Gabris, a spokeswoman for the NTSB told CNN.

‘Part of the investigation will be to request radar data, weather information, air traffic control communication, airplane maintenance records and the pilot’s medical records’, she added, noting that the investigators will also ‘look at the human, machine and environment as the outline of the investigation’.

A preliminary report will be available in 15 days, she said, and the full investigation will take one to two years to complete.

In the meantime, the Colusa County Sheriff’s Office is interviewing people who may have seen the helicopter crash and are asking anyone with any information to contact them.

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