Investigators continue to search for Nancy Guthrie, mother of Today co-host Savannah Guthrie, in Arizona, with no suspect yet identified, Pima County Sheriff Chris Nanos said.

The FBI has offered a $50,000 reward for information leading to her recovery or the arrest and conviction of those responsible.

Evidence suggests a possible abduction: blood matching Guthrie’s was found outside her home, her doorbell camera was disconnected early Sunday, and her pacemaker went offline shortly afterward.

Law enforcement, including FBI personnel, is reviewing security footage, cellphone data, and interviewing neighbors and family, while the family has urged anyone holding her to make contact, CBS News has reported.

Savannah Guthrie and her siblings have made emotional appeals for her safe return, emphasizing that Nancy needs daily medication and is in fragile health.