Dozens of people are missing in Oregon as two large fires threaten to merge and hundreds of thousands are ordered to evacuate.

The western US is reeling from a devastating wildfires season that has destroyed more than 2.6 million acres in California alone, killed at least 24 people, and given the area the world's worst air quality.

Two fires in Oregon were in danger of coming together on Friday near the suburbs of the state's biggest city, Portland.

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