CLACKAMAS, OR -- An Oregon fitness club owner was arrested on charges of sexually abusing an 18-year-old woman whom he invited to the club for a free session.

Bryce Jackson was arrested Monday at his Real Fitness club in Clackamas, OR. He posted bond the next day and was released from custody, according to local media reports. A preliminary hearing will be held next week.

Jackson allegedly offered the free session to the woman about two weeks ago at the coffee shop where she worked. When she arrived at the near-vacant club, Jackson allegedly locked the door behind them, directed her to do some exercises and photographed her. He then allegedly started massaging her before he sexually abused her. The woman ran out of the club and called her mother from her car before notifying the police, according to reports.

Local authorities also are investigating other possible victims of Jackson’s at the club.