India, March 24 -- Investigators looking for Nancy Guthrie are examining a potential event at the 84-year-old's residence in Arizona - just weeks before her abduction, according to the local sheriff.

Pima County Sheriff Chris Nanos, who is currently under significant scrutiny due to the unsuccessful 52-day search, stated that officials had focused their attention on an evening three weeks before the confirmation of the disappearance of Savannah Guthrie's 84-year-old mother.

"We do believe that something occurred on Jan. 11, and that's with the FBI's analysis of the equipment and digital stuff they've done," Nanos told KOLD on Monday.

Nanos, who is overseeing the probe, declined to elaborate on the evidence that prompted investigators t...