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OKLAHOMA CITY – A call came in just after midnight to firefighters from concerned neighbors reporting seeing visible flames coming from a home.

About 12:30 a.m. neighbors could see flames leaping from the roof of the house located in the 3300 block of North Ollie.

When crews arrived reports of heavy smoke were coming from the attic.

Crews were able to knock down the fire quickly.

Investigators say the home was a vacant structure and are unsure how the fire started.