<div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Four people have been charged over the death of a five-year-old boy who was killed inside a pressurised oxygen chamber that exploded at a </span><a href="http://9news.com.au/usa" rel="" target="" title="US"><span>US</span></a><span> </span><a href="http://9news.com.au/healthy" rel="" target="" title="medical"><span>medical</span></a><span> facility.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Thomas Cooper from Royal Oak, Michigan, was pronounced dead at the scene. His mother was standing next to the chamber and suffered injuries to her arms when it exploded January 31 at the Oxford Centre in Troy, suburban Detroit.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Online court records show the centre's founder and chief executive, Tamela Peterson is charged with second-degree murder. The other defendants are Gary Marken, 65, and Gary Mosteller, 64, charged with second-degree murder and involuntary manslaughter; and Aleta Moffitt, 60, charged with involuntary manslaughter and intentionally placing false medical information on a medical records chart.</span></div></div><div><div id="adspot-mobile-medium"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/world/donald-trump-doubles-planned-tariffs-on-canadian-steel-and-aluminium-to-50-per-cent-as-trade-war-intensifies/60c5f49c-30cc-4635-ac69-eecb9d9e7681"><strong><span>Trump doubles planned tariffs on Canadian steel and aluminium</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Arraignments were scheduled on Tuesday afternoon (Wednesday AEDT) in Troy District Court, Lieutenant Ben Hancock said. The case is being prosecuted by Michigan Attorney General Dana Nessel and details were expected to be released during a late morning news conference.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Raymond Cassar, Marken's attorney, said the second-degree murder charge comes as "a total shock" to him and his client.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"For fairness, he is presumed innocent," Cassar said.</span></div></div><div><div class="OUTBRAIN" data-reactroot="" data-src="//www.9news.com.au/world/thomas-cooper-four-charged-over-death-of-fiveyearold-boy-in-hyperbaric-chamber-explosion/c6ccac7a-c6d0-4717-8023-9f4d8c820a84" data-widget-id="AR_5"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"This was a tragic accident and our thoughts and our prayers go out to the family of this little boy. </span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"I want to remind everyone that this was an accident, not an intentional act.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"We're going to have to leave this up to the experts to find out what was the cause of this."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/national/shark-attack-surfer-wa-esperence/f26195fa-7c42-4fda-ac7a-2d591dbb9527"><strong><span>Surfer taken by shark in front of girlfriend on beach identified</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Moffitt's lawyer, Ellen Michaels, declined to comment before Tuesday's arraignment. The Associated Press left a telephone message Tuesday morning seeking comment from Peterson's attorney. An attorney was not listed for Mosteller.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>A voicemail was left seeking comment from an attorney representing the Oxford Center. The AP also left a message seeking comment from the center.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>The Oxford Centre had said in an email following the explosion that a fire started inside the hyperbaric oxygen chamber.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"The safety and wellbeing of the children we serve is our highest priority," the centre said. </span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/national/perth-news-indian-national-guilty-of-attack-on-worker-perth-airport/025b6f5c-feaa-405b-8cae-91716416b387" rel="" target="" title=""><strong><span>Man erupts while checking in for Bali flight</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"Nothing like this has happened in our more than 15 years of providing this type of therapy. We do not know why or how this happened and will participate in all of the investigations that now need to take place."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Hyperbaric therapy increases delivers pure oxygen to a person's body inside the pressurised chamber. That's up to five times the amount of oxygen in a normal room, Troy Fire Lieutenant Keith Young said following the explosion.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"The presence of such a high amount of oxygen in a pressurised environment can make it extremely combustible," Young said. </span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"We did some initial investigation. This is very uncommon, so we're not sure what led up to it."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><em></em><a href="https://www.9news.com.au/national/how-to-follow-9news-digital/29855bb1-ad3d-4c38-bc25-3cb52af1216f"><em><strong><span>DOWNLOAD THE 9NEWS APP</span></strong></em></a><em><strong><span>: Stay across all the latest in breaking news, sport, politics and the weather via our news app and get notifications sent straight to your smartphone. Available on the </span></strong></em><a href="https://apps.apple.com/au/app/9news/id1010533727"><em><strong><span>Apple App Store</span></strong></em></a><em><strong><span> and </span></strong></em><a href="https://play.google.com/store/apps/details?id=nineNewsAlerts.nine.com&amp;hl=en_AU"><em><strong><span>Google Play</span></strong></em></a><em><strong><span>.</span></strong></em></div></div>