Authorities responded to a “major fire” incident around 10:30 a.m. Tuesday at the Firehouse 9 Farm venue in the city of Gilmer, according to a news release from the Upshur County Sheriff’s Office, reports CNN.

“The incident involved fireworks explosions and other volatile incendiaries,” the release said. “One person is deceased at the location, and four others are confirmed injured.”

Police, however, did not name the victims.

The Texas State Fire Marshal’s Office and the Bureau of Alcohol, Tobacco, Firearms and Explosives are investigating the fire, the release said.