Troy police say Tamela Peterson ran away when asked for her cellphone after Thomas Cooper died in a hyperbaric chamber fire at the Oxford Center.

Two other people were arrested Monday and also are expected to be arraigned in the child's death, police said.

Police in Michigan have arrested four people after a 5-year-old boy receiving treatment at The Oxford Center died when the hyperbaric chamber he was in exploded.

His mother was standing next to the hyperbaric chamber and suffered injuries to her arms when it exploded Jan. 31 at the Oxford Center in Troy.

The child who died in the Jan. 31 hyperbaric oxygen chamber fire was 5-year-old Thomas Cooper, of Royal Oak. He was trapped in the chamber when it caught fire, the family's attorney says.

Troy police said arrests Monday were tied to Jan. 31 fire that killed Thomas Cooper. The boy, 5, was inside the chamber when it exploded.

Four people have been arrested after a boy, 5, died in a hyperbaric chamber explosion on Jan. 31, it's been reported.

Allegedly, neither a medical doctor nor a safety supervisor was at the medical facility when the chamber exploded.

The Michigan attorney general has accused the owner of a medical center and three of its employees of ignoring safety standards to make a profit.

Michigan Attorney General Dana Nessel has charged four people in connection with the death of a 5-year-old boy who was killed in a hyperbaric chamber explosion.