No other details about the investigation have been released.
Crews spent nearly an hour extinguishing the fire that broke out before dawn at the fireworks storage center in Fort Mill.
>>Photos: Fireworks storage containers go up in flames
Emergency crews were called around 5:45 a.m. to the fireworks storage containers near Davey Jones Fireworks along Carowinds Boulevard, just off Interstate 77.
Firefighters are battling a fire at Davy Jones Fireworks store on the section of Carowinds Blvd. near the store is closed. You can turn North towards Carowinds Park off Ext 90 but not south. #YCSONEWS #YOCONEWS pic.twitter.com/knAxLxMM63
— York County Sheriff (@YCSO_SC) July 4, 2019
Shells and rockets burst through the metal containers, sending colorful showers into the air above Davey Jones Fireworks and the House of Fireworks.
WSOC crews on the scene could see flames and smoke billowing from the area.
York County deputies said the fire was not actually at the fireworks store but started in containers just outside the store.
Viewer video sent to WSOC showed the fireworks shooting into the sky and exploding just before dawn.
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