Arizona police are searching for three suspects after a fireworks display at a Phoenix Walmart store was set on fire on Wednesday.Cellphone video shows the fireworks burning and exploding, as a thick plume of smoke rises to the roof.The store was evacuated and there were no reports of serious injury. Several employees were treated at the scene for respiratory issues.The incident could have escalated quickly if not for the store’s sprinkler system, which prevented the blaze from spreading to a nearby display of lighter fluid, charcoal, and propane tanks.Security camera footage captured three suspects walking away from the fireworks display as the blaze began.Police are searching for two men and a woman.Fire crews reported heavy smoke and water damage inside the store.