Firefighters on Monday battled an apartment fire in Snohomish.

The roof of the building at 317 Avenue J collapsed. 30 people evacuated from the building, including several pets.

Firefighters three units on the top floor had heavy fire damage. They traced the fire to the back deck of one of those units, but said it was too unstable to investigate any further Monday night.

They ruled out a barbeque as the cause. The residents of the unit were not home when the fire broke out.

No injuries were reported.

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