Kathlynn Shepard, 15, and an unidentified second girl, 12, were taken to an agricultural building southwest of the town after they stepped off a school bus Monday afternoon. The younger girl escaped by running to a nearby home, The Des Moines Register reported Tuesday.
The newspaper added the younger girl was treated for unreported injuries and released.
As a massive community search for Shepard continued, a suspect, Michael Klunder, 42, was found dead in a home on a rural property northeast of Dayton, officials said.
Klunder's name is listed in the Iowa Sex Offender Registry, which mentions he has no residency restrictions.