The desperate search for Nancy Guthrie, the mother of "Today" anchor Savannah Guthrie, has gripped the nation since she disappeared in Arizona nearly two weeks ago.

NewsNation is diving into the chilling details of the investigation in a special live report anchored by NewsNation's Brian Entin Saturday at 8p/7c. Find your channel here.

Authorities believe Guthrie was kidnapped or abducted from her home in Pima County and are tracing thousands of tips.

Timeline: The disappearance of Nancy Guthrie

From the last spotting of Nancy Guthrie to the latest emerging details, here's everything we know about the 84-year-old's disappearance.

Tracking every moment >

Investigators described the suspect as a man with an average build, about 5 feet, 10 inches tall. In doorbell video footage, the suspect is seen wearing a black, 25-liter Ozark Trail hiker pack, a product line specific to Walmart stores.

The FBI has doubled its reward to $100,000 for information leading to the location of Guthrie. Anyone with "actionable information" is asked to contact 1-800-CALL-FBI or the Pima County Sheriff's Department nonemergency line at 520-351-4900.

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Confusion sets in: Law enforcement turf war sparks concern

An FBI official told NewsNation the local sheriff is blocking agents from accessing key evidence, including a glove and DNA samples.

Possible disconnect >

Take a look: Here's what we know about the suspect

Investigators have revealed identifying details about the person they say kidnapped Nancy Guthrie from her Arizona home.

What to watch for >

Keep reading: Key evidence released so far

Between ransom letters, a discovery of blood and chilling surveillance footage, evidence is stacking up in connection to Nancy Guthrie's disappearance.

Following leads >

NewsNation's Missing

Each week, Marni Hughes brings you the story of a person who has disappeared. Many of the cases we cover come from you. Let us know if there's a case you think we should look into. Missing cases we're tracking >

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