India, Feb. 9 -- The investigation into the disappearance of 84-year-old Nancy Guthrie, the mother of TODAY show host Savannah Guthrie, has entered a critical phase. In a recent update, the sheriff's department said the investigation is ongoing across multiple locations, with no scheduled press briefings unless significant developments occur.

Here is what authorities and reporting have revealed so far.

Arizona authorities believe Nancy Guthrie was likely abducted from her Tucson-area home while she slept, per Pima County Sheriff's officials.

The Pima County Sheriff's Department said it will "maintain a presence" at Nancy Guthrie's residence for security purposes at the request of the family, according to a statement shared with media p...