GRAND CANYON NATIONAL PARK, Ariz. (AP) — A firefighter working at the scene of a wildfire burning since July at the Grand Canyon died Monday after suffering a cardiac emergency, authorities said.

The firefighter was actively involved in fire suppression repair near the North Rim Entrance Station at the time, the Dragon Bravo Fire incident management team said in a news release. A paramedic attempted to revive him but was unsuccessful, it said.

The National Park Service is investigating the death in coordination with the Coconino County Medical Examiner.

Fire suppression repair restores land disturbed by firefighting by dismantling bulldozer piles, stabilizing soil and reestablishing vegetation.

The fire was sparked by lightning on July 4. Authorities initially managed it by clearing

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