Kaufman County Assistant Fire Marshal Randy Richards told The Dallas Morning News that the Saturday night explosion happened as three teens and an adult used a cutting torch to open a 55-gallon barrel inside a structure behind a residence.
The newspaper reported the teens had possible first and second-degree burns.
One of the other two victims drove himself to a hospital, and the fourth declined treatment. Richards said a flammable liquid may have been involved.
Kaufman is located 30 miles east of Dallas.
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