A 5-year-old Michigan boy who was killed in a hyperbaric chamber last week has been identified.

According to the Detroit Free Press, Thomas Cooper’s family said he was the boy who died in a hyperbaric chamber explosion at The Oxford Center in Troy. The Oxford Center provides treatment to children with various conditions, including autism, ADHD, and cancer, though it is unclear what Cooper was being treated for when he died there on Thursday.

The Detroit Free Press reported that a law firm is representing Thomas’ family and his mother, who was injured in the explosion.

READ: 5-Year-Old Boy Killed When Hyperbaric Chamber Explodes

Firefighters who responded to the explosion found Cooper dead inside the device which provides oxygen therapy to patients. The fire was reportedly contained within minutes.

Though explosions are rare, hyperbaric chambers contain 100 percent oxygen — three times more than a typical room. As a result, the environment inside these chambers is extremely combustible, Troy police explained.

“Our initial research shows that this is not a common incident and the scene remains under active investigation,” Troy Fire Department Lt. Ken Young said, per MLive.

A spokesperson for The Oxford Center told the Detroit Free Press that the cause of last week’s explosion remains unknown.

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