IOWA CITY (AP) — The mom of one of the two missing Iowa cousins says she went through a lengthy polygraph test that should prove that she had nothing to do with their disappearance.

Misty Cook-Morrissey said a state agent asked several questions during Monday’s test about whether she had anything to do with the abduction of her daughter, 10-year-old Lyric Cook-Morrissey, and niece, 8-year-old Elizabeth Collins.

The girls disappeared July 13 while riding bikes near a lake in Evansdale. The FBI says investigators believe they were abducted but are alive.