Three people have been charged with second-degree murder after a 5-year-old boy was killed when a hyperbaric chamber exploded at a medical facility in Michigan earlier this year, officials announced Tuesday.

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.

Charges have been filed against four people in the Troy hyperbaric chamber explosion that killed a child. The Pulse discusses what regulations need to come to prevent another tragedy.