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David Muir, ABC's World News Tonight, America's Most Watched Newscast, now streaming same day with all the breaking news of the day on Disney Plus, most watched, most trusted.

Now on Disney Plus every night.

Tonight, late developments in the search for Nancy Guthrie, the mother of today host Savannah Guthrie.

What police are now saying, a dangerous Arctic blast slams the east with some of the

coldest temperatures in years. An American skier, Lindsay Vaughn's winter games, comes to a heartbreaking

end in Italy. First, the desperate search for Nancy Guthrie one week after she disappeared.

Savannah Guthrie's and her siblings release a somber video on Instagram, speaking directly to the people

who sent that last ransom note pleading for their mother's return.

This is very valuable to us, and we will pay.

The latest from authorities on the investigation is Nancy Guthrie's church prays for her safety.

Erin Kuterski reports from Tucson.

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