Four people suffer minor injuries in Griffith Park helicopter crash.

Four people were aboard a helicopter that crashed in Griffith Park on Thursday afternoon, but their injuries appear to be minor, authorities said.

The crash was reported at 2:17 p.m., Los Angeles Fire Department officials said.

At least one person was taken to the hospital for evaluation, but the injuries were not life-threatening. The other three are being evaluated at the scene, authorities said.

A park ranger was also taken to the hospital with heat exhaustion, Los Angeles Fire Capt. Jamie Moore said.

The helicopter went down in a hilly area of Griffith Park that's criss-crossed by hiking trails.

It's unclear what caused the helicopter to crash.

Officials from the Federal Aviation Authority said they will investigate.

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