Authorities are reviewing whether to file federal charges against a Massachusetts man who is accused of bringing a woman from a group home there to a family camp in Maine and then raping her.

William Duffy, 58, was arrested May 3 and charged by the Cumberland County Sheriff’s Office with two counts of gross sexual assault, punishable by up to 10 years in prison and a $20,000 fine. He also is charged with two counts of unlawful sexual contact because the woman did not have the mental capacity to consent to sex. He is currently free on bail pending an appearance in state court.

Now federal prosecutors are deciding whether to charge Duffy with crossing state lines for the purpose of committing a crime.

Duffy allegedly had an online chat with the 31-year-old woman over three weeks on a website for abused women. The woman complained of being abused and denied medication at her group home in Carver, Massachusetts.

Duffy offered to help her escape, the sheriff’s office said. She sneaked out and the pair drove to a camp in Sebago owned by Duffy’s parents.

Police said Duffy then had sex with the woman, who told an investigator she did not feel she could say no.

Police said the alleged victim appeared to have the intellectual capacity of a 9-year-old. Still, she was able to surreptitiously call police on a cellphone and hide the phone under her pillow as she and Duffy were having sex.

Cumberland County Sheriff’s deputies working with the Regional Communications Center in Gray traced the call to Northwest River Road in Sebago where they found Duffy and the woman.

Police say it’s fortunate the woman was able to call for help when she did because she might not have been able to later.

Deputies executing a search warrant discovered a backpack containing several items used in sadomasochistic sex including commercial and heavy-duty plastic zip ties, a “pet safe” shock collar, two rolls of duct tape, two 100-foot lengths of rope, and a number of other sexual devices.

During the encounter, Duffy threatened the woman and said if she did not have sex with him he would tie her up and have sex with her anyway, the sheriff’s office said. Duffy also told her he was taking her to Rhode Island, which is where she thought she was, the sheriff’s office said.

Police say other items they found have led them to investigate whether Duffy molested any other victims, including children.

Police found a plastic bag from the store Amazing Intimacies that contained, among other things, a “Hello Kitty” child’s nightgown and a pair of multicolored panties that had been worn.

“There’s certainly a concern there may be other victims,” Foss said. “There’s no explanation for why he has these items.”

The sheriff’s office asked for the State Police Computer Crimes Unit to copy the contents of Duffy’s cell phone and laptop computer to search for incriminating images. Federal authorities have the contents of those devices.

“There may be other victims but at this point, we’re not aware of any others,” Foss said.

The U.S. Attorney’s Office is reviewing the material but has not decided whether to take the case. Federal crimes typically have much longer prison terms than crimes charged by state officials.