SANTA ANA (CBSLA.com) — Firefighters say they put out a three-alarm fire Sunday at a strip mall in Santa Ana.

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About 75 firefighters responded to the shopping center in the 2200 block of South Fairview Street, according to the Orange County Fire Authority.

The blaze ignited at 1:12 a.m. and was extinguished an hour later.

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The fire caused severe damage to two of the nine units.

Approximately one-third of the center sustained smoke damage.

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The cause of the fire is still under investigation.