Investigators use digital info in search for Iowa student

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BROOKLYN, Iowa -

Federal and state investigators are poring through data related to a missing University of Iowa student's digital footprint in an effort to track her whereabouts and online activities in the hours before her disappearance.

Iowa Division of Criminal Investigation spokesman Mitch Mortvedt said Wednesday that investigators believe they've "put together a pretty solid timeline" of what 20-year-old Mollie Tibbetts was doing before she was last seen jogging in her hometown of Brooklyn, Iowa, the evening of July 18. Mortvedt says he can't give details of those activities.

Mortvedt says the data comes from several search warrants issued to social media and fitness tracking companies, including Fitbit. Friends and family say Tibbetts, an avid runner, was usually wearing her Fitbit.