The fire on Sept. 5 led to the evacuation of the Orange County store as flames quickly reached to the ceiling and spread through the children's clothing section.
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A store employee with a fire extinguisher and the building's sprinkler system were able to put out the blaze.
No injuries were reported but merchandise and the store itself were damaged by flames, smoke and water.
The video in the player above is from a previous report.
The damage is estimated at $1 million in retail goods and $500,000 to the interior of the building itself.
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Buena Park police say they "determined the fire was intentionally set during an attempt to steal baby formula."
They identified and arrested a suspect, Cynthia Torres, 40. Her city of residence was not disclosed in the police statement.