TOLUCA, Mexico (AP) — Authorities in central Mexico have detained a doctor and three workers at a clinic after a patient was found dead inside a hyperbaric chamber.

Mexico state's top prosecutor Miguel Contreras says the 60-year-old patient was found inside the oxygen machine at a clinic in the city of Toluca early Tuesday. He says Filemon Consuelo Loria was left inside the chamber overnight.

He says the diabetic patient had gone to the clinic Monday afternoon for a 40-minute session.

Contreras says investigators haven't determined if the clinic workers left Consuelo Loria inside the hyperbaric chamber by mistake or on purpose.