SPARTA, Wis – The fire that caused an estimated $7 million damage at the Walmart superstore In Sparta was started in the fabric section, the store’s security video shows. A teenager has been charged with arson. The Wisconsin Division of Criminal Investigation, which is leading the investigation, did not determine immediately how blaze was ignited or whether there was an accelerant. The store, Sparta’s largest retailer, said it would be closed indefinitely to ventilate the smoke that caused most of the damage. The fire was reported about 10:45 a.m., Tuesday. Less than a minute later when the first fire crew arrived, customers and employees were already streaming out into the parking lot.

Across the aisles. Security video shows early flames, before the store filled with smoke.