WILLIAM BRANGHAM: In the day's other# news: The search for Nancy Guthrie,## the mother of "Today Show" anchor Savannah# Guthrie, continued for a fifth day.

Authorities believe she's been kidnapped and# remains alive, but there are no current suspects.

As Stephanie Sy reports, the FBI is offering a# $50,000 reward for information that leads to the## recovery of Nancy Guthrie and for any information# leading to arrests and convictions in this case.

SAVANNAH GUTHRIE, Co-Host, "The Today# Show": Our mom is our heart and our home.

STEPHANIE SY: Last night, a heart-wrenching# statement and a public plea.

SAVANNAH GUTHRIE: We too have heard the reports# about a ransom letter in the media.

We are ready## to talk.

However, we live in a world where# voices and images are easily manipulated.## We need to know, without a doubt, that# she is alive and that you have her.

STEPHANIE SY: Savannah Guthrie and# her siblings, Annie and Camron,## addressing their mother's kidnapper# after police say 84-year-old Nancy## Guthrie was taken from her home in# Tucson, Arizona, against her will.

CHRIS NANOS, Pima County,# Arizona, Sheriff: We believe## Nancy is still out there.. STEPHANIE SY: Today, the Pima County sheriff# said they have not identified any suspects.## The FBI confirmed they're looking into a# ransom letter that was sent to news media.

HEITH JANKE, FBI Special Agent in Charge: As with# every lead, we are taking it seriously.

We are in## communication with the family.

And while we advise# and recommend from a law enforcement perspective,## any action taken on any ransom is# ultimately decided by the family.

STEPHANIE SY: It's by far the most significant# update in the case after long days of searching.## Nancy Guthrie was last seen Saturday night# after dinner with her family.

They dropped## her off at home in Tucson's Catalina# Foothills, where she lives by herself.

She was reported missing 14 hours later,# when she didn't show up to church.

Guthrie## has limited mobility, a pacemaker, and, adding# to the urgency, relies on daily medication.

This HEITH JANKE: This is an 84-year-old grandma that# needs vital medication for her well-being.

You## still have the time to do the right thing before# this becomes a worse, much worse scenario for you.

STEPHANIE SY: Law enforcement has been speaking## to residents and trying to obtain any# video footage available from neighb.. TOM PEW, Catalina Foothills Association:# It's a high desert, Sonoran Desert,## and there are a lot of trees, and# saguaros, and native vegetation.## So these door cameras really only work around# the door of the house.

If you're trying to## use a door camera to see someplace else,# there's things that block that view.

So... STEPHANIE SY: Tom Pew has lived in the# Catalina Foothills community for 50 years.

TOM PEW: People often know their neighbors and# see them on the road.

People walk their dogs.

And## I don't think the neighborhood is -- it's not the# least bit dangerous.

It does not feel dangerous.

MAN: We pray for our sister Nancy.

STEPHANIE SY: As the investigation# continues, prayers are echoing at## church vigils from Tucson to New York City.# President Trump has called Savannah Guthrie,## pledging to deploy more federal resources.

And# while authorities have not found proof of life,## they are working on the assumption that# Nancy Guthrie may yet be brought home.

For the "PBS News Hour,"# I'm Stephanie Sy in Phoenix.

SAVANNAH GUTHRIE: We love you, Mom.