(LOS ANGELES) — A fast-spreading wildfire in California’s wine country prompted mandatory evacuation orders as firefighters continued to battle the blaze from the ground and air on Sunday.

The Pickett Fire in Northern California’s Napa County has burned some 6,531 acres since it broke out Thursday, according to the California Department of Forestry and Fire Protection.

As of late Saturday night, the fire was 11% contained, CalFire said.

The fire broke out around 3 p.m. local time on Thursday near the town of Calistoga, officials said. The cause of the blaze remains under investigation.

In an update Saturday on its website, CalFire said crews have been aided during the nighttime fighting of the fire by night-flying helicopters and drones.

The fire is in the same region as the massive G

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