The FBI announced on Thursday that it would increase the reward to $100,000 for information leading to the location of Nancy Guthrie or to the arrest and conviction of anyone involved in her disappearance.

The FBI has put out six surveillance photos and two videos of a potential suspect in the Tucson, Arizona, kidnapping of Nancy Guthrie, the 84-year-old mom of Today show co-anchor Savannah Guthrie.

New identifying details about the suspect in Nancy Guthrie's kidnapping have been confirmed after a forensic analysis, the FBI said on Feb. 12.

The bureau identified the male suspect's height and backpack seen in previously released photos

The suspect in the disappearance of Nancy Guthrie is described as male, approximately 5’9” - 5’10” tall, with an average build, according to the FBI, which increased its reward to $100,000 from $50,000.

An image the FBI released of the suspect​ at Nancy Guthrie's front door, without a backpack, was captured by her Nest doorbell camera prior to the night of her abduction.

New details are coming to light in the ongoing search for Savannah Guthrie’s mother, Nancy Guthrie. According to a law enforcement source, the masked man suspected of abducting the 84-year-old may have been at her front door before February 1,

The search for Nancy Guthrie has passed the one-month mark as authorities continue searching for clues into the 84-year-old's mysterious disappearance

The masked figure suspected of kidnapping Nancy Guthrie may have been at her front door earlier than Feb. 1 .

Over a month has passed since Nancy Guthrie was last seen. Here's what to know about the 84-year-old and where the investigation stands.