COLO, Iowa (AP) — A registered sex offender in Iowa faces new charges after investigators say he molested several young boys on camping trips to a Story County park. Des Moines television station KCCI reports that 30-year-old Michael Ferguson took several boys between the ages of 9 and 14 camping at Hickory Grove Park in Colo between May 2017 and February. Court documents say Ferguson forced at least four children to perform sexual acts.

Ferguson was recently arrested in Stark County, Ohio, and extradited to Story County. He’s charged with two counts of second-degree sexual abuse, assault with intent to commit sexual abuse and indecent exposure. He’s being held in lieu of $500,000 bail. Ferguson was convicted of assault with the intent to commit sexual abuse of a teenage boy in 2008.