Firefighters are concentrating on mop-up work at the Sandy Fire.

The fire might have started when an individual "hit a rock with a tractor" in the area.

On Tuesday, fire officials said the Sandy Fire had experienced significant growth due to shifting winds, steep terrain and canyon-driven fire behavior.

Hundreds of firefighters continue to tackle the Sandy Fire in Simi Valley on May 21, three days after it first ignited.

Los Angeles firefighters found a symbol of the everlasting in the ashes of family home destroyed by the Sandy Fire. Members of LAFD Engine 85 were sifting through burned out portions of the Simi Valley home when they found a wedding ring that belongs to the Boyle family.

Firefighters are racing to keep flames away from the Santa Susana Field Laboratory, a former nuclear and rocket testing site.

All Simi Valley schools will be closed for the remainder of the week due to the Sandy Fire, the school district announced Wednesday on its website.

Firefighters discovered some precious items after coming to the aid of a family whose home was destroyed by a fast-moving wildfire in Simi Valley this week.

The Sandy Fire has burned over 2,141 Acres and is 40% contained as of Friday, May 22, according to the California Department of Forestry and Fire Protection