What we still don't know about the disappearance of Savannah Guthrie's mother

Here is a 167-word summary of the news article: The disappearance of 84-year-old Nancy Guthrie from her home in Tucson, Arizona, nearly a week ago remains a mystery. Guthrie is the mother of NBC News anchor Savannah Guthrie. Police and search teams have been scouring the area, but so far there are no clear leads on Guthrie's whereabouts. Authorities have not found any evidence of foul play, and Guthrie's car and purse were left at her home. Her family is deeply concerned, as Guthrie suffers from dementia and requires medication. The search continues, with police asking the public for any information that could help locate the elderly woman. The case highlights the challenges faced by families caring for loved ones with cognitive decline, and the fear and uncertainty that can arise when they suddenly go missing. Investigators are pursuing all avenues, but the circumstances surrounding Guthrie's disappearance remain unclear.