'Today' show host Savannah Guthrie said she wakes up 'every night' imagining her mother's 'terror'

• Savannah Guthrie opened up about her emotional struggle over her mother's disappearance on "Today."
• Guthrie told her "Today" show co-anchor Hoda Kotb that her family is in "agony."
• Authorities believe Savannah Guthrie's mom, Nancy Guthrie, was abducted from her Arizona home.

"Today" show host Savannah Guthrie has opened up about her family's "agony" during her first interview since the disappearance of her mother more than seven weeks ago.

"It is unbearable," Guthrie told her co-anchor Hoda Kotb through tears during a preview of the emotional interview that aired on the "Today" show on Wednesday.

"And to think of what she went through. I wake up every night, in the middle of the night, every night. And in the darkness, I imagine her terror, and it is unthinkable, but those thoughts demand to be thought, and I will not hide my face, but she needs to come home now," Guthrie said of her mom, Nancy Guthrie.

The rest of the interview is set to air in two parts on Thursday and Friday on the NBC morning program.

"As you'll see in the coming days, she talks about so many things. She talks about the investigation, she talks about her faith, and she talks about how she's getting through," Kotb said Wednesday.

Savannah Guthrie has been on hiatus from the "Today" show since her mother's disappearance. A "Today" show spokesperson has previously said she plans to return to co-hosting the morning show at some point.

Authorities believe that the 84-year-old Nancy Guthrie was abducted from her ranch-style home just outside of Tucson, Arizona, in the middle of the night.

The woman was last seen on January 31, when she was dropped off at her home after dinner at her daughter, Annie Guthrie's, house, authorities have said.

Local law enforcement and the FBI have been working to identify the masked and armed man who was captured on footage from Nancy Guthrie's missing Nest doorbell camera the night she vanished.

Early on, investigators found drops of blood on Nancy Guthrie's porch that were later confirmed to be hers.

Last month, the Guthrie family offered up a $1 million reward for the return of Nancy Guthrie, which is on top of the $100,000 that the FBI has already offered for information related to her disappearance.

In an Instagram video post announcing the reward, Savannah Guthrie acknowledged her mother may already be dead, saying, "We also know that she may be lost."