Sheriff in Nancy Guthrie case believes they know kidnapper's motive

The 84-year-old mother of US TV presenter Savannah Guthrie was kidnapped 41 days ago.

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Pima County Sheriff Chris Nanos told NBC News that "we believe we know why he did this". He said authorities "believe it was targeted", but they were "not 100% sure of that".

Guthrie, 84, has been missing since she was taken from her home in Tucson, Arizona, on 1 February.

A nationwide search has unveiled certain clues, including DNA evidence and ransom notes, but no suspect has been identified.

Nanos declined to elaborate on the suspected motive, as he said it could compromise the integrity of the ongoing investigation to do so.