GARDENA ( — Authorities were investigating Wednesday how a second-alarm fire was sparked overnight at a Gardena tire shop.

The fire was first reported at 2:21 a.m. at Collins Firestone, 1112 W. Gardena Blvd. in Gardena.

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Arriving firefighters found flames that threatened to spread to neighboring buildings and bring down the entire tire shop, according to Los Angeles County Fire officials.

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The blaze was knocked down within a half hour after the second alarm call and a partial collapse. No injuries were reported, and more than 80 firefighters at the scene kept the fire from spreading to two adjoining businesses.

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A damage estimate was not immediately available.