FAYETTE, Iowa (AP) — A sheriff says three more certified nursing assistants are charged with sexually exploiting patients at an Iowa facility for mentally disabled adults. Two CNAs at the Prairie View Residential Care Facility in Fayette were charged with sexual exploitation March 5. Fayette County Sheriff Marty Fisher said Monday that three additional former CNAs have been charged for alleged relationships dating to 2015.

The women ages 24, 31 and 43 were arrested and have been released. One’s accused of having a patient perform oral sex on her 30 times; another is accused of engaging in “heavy kissing and touching” with a patient twice. The third’s accused of having a weeklong sexual relationship. Fisher says the patients involved were undergoing court-ordered treatment.

He says investigators are looking into “further incidents where more charges could be filed.” The home provides skill-building services for adults with chronic mental illness.