ST. LOUIS (KSDK) - Three homes in north St. Louis are damaged, after a two-alarm fire early Thursday morning.

Investigators say it started at a home in the 5500 block of Vernon and spread to two neighboring houses.

At one point, 50 firefighters were on-scene to fight the massive blaze.

All three homes were vacant, and no injuries reported.

No word yet on a cause.

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