A hammer caused the biggest fire in California 's history

In 2018, California was the victim of the largest forest fire in its history. The "Ranch Fire" started on July 27, 2018 and traveled nearly 13 kilometers. On its own, it burned 1,660 km² across the counties of Mendocino, Colusa, Glenn and Lake.
As you can see in the video at the head of the article, an investigation was initiated by the California Department of Forests and Fire Protection to understand the origin of this gigantic fire. And Wednesday, June 5, 2019, this department has finally revealed the cause of this forest fire, a simple hammer.....