Fresno firefighters responded just before 1 p.m. Monday to multiple 911 calls reporting a vacant house fire on the 1200 block of W. Vassar Avenue.

Crews arriving at the scene saw a large column of smoke and declared a working fire. Firefighters found heavy smoke coming from a vacant, boarded-up home.

Initial reports suggested someone might be inside, prompting crews to enter rescue mode and request a second alarm for additional resources.

No one was found inside, and no injuries were reported.

The fire caused extensive damage, and authorities said the cause remains under investigation.

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