PLYMOUTH, Mass. – An Oxford, Maine, man charged with assaulting and raping a pair of teens in Massachusetts may see some of the charges against him dropped by the end of the week.

A spokeswoman for the Plymouth District Attorney’s office said Thursday there was not enough evidence to charge Jeffrey Witham with assaulting and forcibly raping a 14-year-old girl or assaulting and kidnapping a 13-year-old girl.

Witham, 18, was a carnival worker at the Marshfield Fair. He remained jailed Thursday night pending a bail hearing scheduled for Friday. He has been locked up since last weekend when a pair of Marshfield girls, 13 and 14, told police that they met Witham while he was working at the fair and that he later raped them and held them against their will.

The girls have since changed their stories, and prosecutors filed paperwork in court to dismiss some of the charges, according to the Patriot Ledger newspaper of Quincy.

Witham, of 100 Fore St. in Oxford, will still face charges of one count of rape of a child with force; indecent assault and battery on a person under 14; and two counts of statutory rape.

Prosecutors want the court to dismiss one count of rape with force; indecent assault and battery on a person over 14; kidnapping; and assault and battery.

Witham has pleaded innocent to the charges and is being held on $150,000 cash bail.

A search of his criminal record revealed no prior convictions or traffic violations.

A judge on Wednesday refused to reduce the bail amount after it was learned that the girls were changing their story. Judge Ronald Moynahan said he had set the bail amount as if Witham had been arraigned on the lesser charge of statutory rape. In Massachusetts it is a crime to have sex with anyone under age 16, with or without consent.

Another bail review is set for Friday.