LOWER LAKE, Calif. (AP) — Fire officials say a massive blaze raging in the Lower Lake area north of San Francisco spread overnight covering more drought-stricken ground.

Cal Fire says the fast-moving has charred 71 square miles by Sunday morning and is threatening 5,000 homes. It is only 5 percent contained.

The fire has destroyed 24 homes and 26 outbuildings.

The wildfire has been raging in an area of hills covered in dense brush and oak trees since Wednesday.

Cal Fire says an evacuation advisory has been issued affecting 12,000 people and several roads have been closed.

The blaze is the biggest of several burning in Northern California.