By Chelsea Bailey, Way Mullery, CNN
(CNN) — It’s been nearly three weeks since Nancy Guthrie vanished from her secluded Tucson, Arizona, home in the dead of night, and investigators say they are no closer to identifying a leading theory or motive behind her abduction.
The saga has become a waking nightmare for Guthrie’s family, with her daughter, Savannah, posting a series of increasingly heartbreaking pleas on social media for her mother’s abductors to “do the right thing” and bring Guthrie home.
A private donor is backing a new $100,000 reward for information leading to the arrest of Guthrie’s captors. Meanwhile, the Pima County Sheriff’s Department and the FBI have increased their reward to $100,000.
Investigators are facing mounting pressure to piece together the fragmented puzzle of evidence they’ve gathered. From chilling surveillance footage and alleged ransom notes to DNA and a collection of gloves, here’s a look at what we know about the evidence in the investigation:
The surveillance footage
In perhaps the biggest break in the case so far, investigators on February 10 released surveillance footage and images recovered from Guthrie’s doorbell camera.
The Nest camera was reported missing after Guthrie’s abduction, but investigators partnered with Google, which owns the camera company, to recover some of the data.
The grainy video shows a man in a ski mask approaching Guthrie’s front door and attempting to cover her doorbell camera with a gloved hand. He then walks off the porch and picks up shrubbery to try to cover the lens.
The FBI later described the person as the “suspect in the kidnapping of Nancy Guthrie.” The agency said the man is approximately 5-foot-9 to 5-foot-10 tall with an average build.
“We hope this updated description will help concentrate the public tips we are receiving,” the FBI Phoenix office said.
Savannah Guthrie later shared the footage on her social media accounts with the caption, “someone out there recognizes this person.”
“We believe she is still out there,” she writes, “Bring her home.”
The backpack
In the footage and images released by the FBI, the suspect appears to have a gun holstered near the center of his waist – an unusual position – and is seen wearing a backpack with reflective straps.
The FBI later said the backpack he’s wearing is a black, 25-liter Ozark Trail Hiker Pack.
The Pima County Sheriff’s Department told CNN the backpack is only sold at Walmart, and investigators are working with the retailer to gather more information.
The glove
As they searched the area around Guthrie’s home, investigators recovered multiple gloves.
But, a glove found about two miles from the house appeared to visually match the ones worn by the suspect, according to the FBI. Authorities took DNA samples from the glove and ran it through the national database known as CODIS, which compares a DNA sample against the profiles of more than 19 million known offenders.
But it did not return any matches.
Authorities have not determined if the glove is connected to the kidnapping.
The DNA
Investigators say they have also recovered DN