OKLAHOMA CITY (AP) - The state medical examiner's office wants to take a deeper look at the deaths of two people at a drug rehabilitation center that uses saunas and vitamins as part of an intensive cleansing regimen.

Last month, 21-year-old Hillary Holten died at the Narconon Arrowhead center at Canadian. Last October, 32-year-old Gabriel Graves died. The rehab facility uses techniques developed by Scientology founder and science fiction writer L. Ron Hubbard and is the training center for Narconon International. Health officials in Quebec closed a Narconon facility last month.

The Pittsburg County Sheriff's Office says Holten and Graves were each found in their beds with no signs of foul play. Autopsies are incomplete, and the state medical examiner's office wants to do more work before determining a cause of the deaths.