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An explosion at the Autoliv facility in Promontory on Thursday injured one worker and started a fire in a building at the Box Elder County plant.

The worker, a 50-year-old man, was flown by helicopter to McKay-Dee Hospital with injuries to his head, including burns, according to Chief Deputy Dale Ward of the Box Elder County Sheriff's Office.

The incident occurred about 4:15 p.m. while two workers at the facility, which makes airbags for cars, were disposing of excess materials, Ward said in a news release. He said the two were removing a completed batch of the airbag materials from an incinerator and preparing to put in a second batch when there was an explosion.

The second worker was not injured.

Agencies responding to the fire included the Box Elder County Sheriff's Office, the Tremonton Fire Department, Tremonton Ambulance, the Box Elder Fire Marshal, the Utah Highway Patrol, ATK Fire and Lifeflight.

Fire personnel kept the blaze contained to the building and were allowing it to burn out because the structure was too unsafe to enter, the news release said.

Autoliv, which is based in Sweden, also operates plants in Brigham City, Ogden and Tremonton.

Twitter: @PamelaMansonSLC