The number of people confirmed dead in wildfires sweeping northern California has risen to 31, as officials warned that conditions would worsen.

Hundreds of people are missing.

More than 8,000 firefighters are now battling the flames.

The wildfires have destroyed more than 3,500 buildings and homes over 170,000 acres and displaced about 25,000 people.

The wildfires are the deadliest in California since 1933.

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