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A man and a woman were seriously injured early Tuesday when an oil storage tank in East Texas exploded while they were smoking, officials said.

The victims, both 24 years old, were on top of a top of a tank at the time of the explosion, KTVT-TV, Fort Worth, reported.

Van Zandt County Fire Marshal Chuck Allen said the man received burns to his face, chest and arms, while the woman suffered life-threatening injuries.

Another of the five tanks at the storage facility near Van, about 70 miles east of Dallas, exploded later.

Firefighters from Van, Grand Saline, Tyler and Lindale were spraying foam to prevent the fire from spreading to the other tanks.

The victims have not been identified, but are not believed to be employees of the facility, WFAA-TV, Dallas, reported.

They were transported to Parkland Memorial Hospital in Dallas, KTRK-TV, Houston, reported.