Investigators have found a glove that appears to match one of those a suspect was wearing in doorbell camera footage taken the night Nancy Guthrie disappeared.

The FBI said in a Sunday update that investigators recovered DNA evidence from the glove, which was found in a field near the side of the road about two miles from Guthrie's home in Tucson, Arizona.

The agency said it has received preliminary DNA test results on the glove and is still waiting for "quality control and official confirmation" before entering an "unknown male profile" into its database.

Guthrie, the 84-year-old mother of US TV news anchor Savannah Guthrie, has been missing for two weeks.

In its Sunday update, the FBI also said it had collected about 16 gloves from various areas near Guthrie's home, though most were discarded by searchers looking for her.

"The one with the DNA profile recovered is different and appears to match the gloves of the subject in the surveillance video," the FBI said.

Earlier this week, investigators released footage from a doorbell camera at Guthrie's front door that shows a masked man wearing gloves and a backpack. In the video, the suspect walks toward the camera and tries to cover it with his gloved hand before grabbing some brush from the front yard to block the camera's view.

After conducting a forensic analysis of the video, the FBI announced earlier this week that it believes the man is between 5ft 9in and 5ft 10in (175-177cm) tall with an average build.

The FBI also highlighted the backpack the suspect was wearing in the video, identifying it as a 25-litre Ozark Trail Hiker Pack.

Authorities believe the suspect in the video kidnapped Guthrie in the early morning hours of 1 February.

The county sheriff's department has said the suspect description "remains a key focus", but added that "investigators are not ruling out any individuals or possibilities".

Guthrie was last seen on 31 January when a family member dropped her off at her home following a get-together at her daughter Annie's house.

Members of her church noticed her absence the following day and notified her family.

In the two weeks since Guthrie's disappearance, the FBI and Pima County sheriff's officers have conducted a massive search operation involving helicopters, sniffer dogs, hundreds of officers, and thousands of tips called in.

Officials have warned that she may be in dire health without her medication. Pima County Sheriff Chris Nanos has said she was "not in good physical health" but had no reported cognitive issues.

Local officials have also said investigators found DNA at Guthrie's address that did not belong to her or anyone close to her.

The FBI has also increased the reward for information about Guthrie's disappearance from $50,000 (£36,700) to $100,000.