A body was discovered inside a burning structure in Cascade Canyon in Fairfax early Friday morning, according to the Marin County Fire Department.

Fire crews responded to a burning structure at the end of a long dirt driveway on Meadow Way around 1:30 a.m., fire officials said.

Firefighters needed about 700 feet of hose to reach the 20-by-35-foot structure that was almost completely destroyed by the time crews arrived, officials said.

By 2:30 a.m., during overhaul operations, firefighters discovered a body in the ashes and debris.

The Marin County coroner's office has yet to identify the body.

The cause of the fire is under investigation.

No other injuries were reported and no other structures in the area were damaged.