Savannah Guthrie makes heartbreaking plea to her mother Nancy's kidnappers

Savannah Guthrie has shared another heartrending plea to her mother's kidnappers after more than two weeks since she disappeared from her home in Tucson, Arizona.

The TODAY anchor told her mom Nancy's kidnappers that it is 'never too late to do the right thing' in her latest video appeal, which called for 'whoever has her, or knows where she is' to come forward.

In her new appeal, Savannah said: "It's been two weeks since our mom was taken. And I just wanted to come on and say that we still have hope. And we still believe."

Addressing her mother's kidnappers directly, the news anchor said: "I wanted to say to whoever has her or knows where she is that it's never too late. And you're not lost or alone. And it is never too late to do the right thing.

"And we are here. And we believe. And we believe in the essential goodness of every human being."

She added: "Bring her home. It’s never too late to do the next right thing."

Her appeal came amid several twists and turns in the investigation into the 84-year-old's disappearance from her home in the early hours of February 1, including new DNA evidence recovered by police.

On Sunday, investigators recovered a glove containing DNA that appears to match the one being worn by a suspect seen on the doorbell camera of her home. It was found in a field next to a road just two miles from where she went missing.

On Sunday, FBI agents announced that the DNA found in the glove was that of a male and distinct from other gloves recovered in the area.

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

This development comes barely a week after officials released footage recovered from the backend system of Nancy's doorbell camera, which showed a masked and armed individual approaching her home to tamper with the surveillance camera.

Following forensic analysis of the video, the FBI stated that they believe the individual to have been 5ft 9 or 5ft 10, and of an average build.

Local police said the person captured on camera had become a 'key focus' in their search, but added that investigators are not ruling out any individuals or possibilities.

Previously, police in Pima County warned that the 84-year-old was 'not in good physical health' when she disappeared and is in dire need of medication.

The award for information leading to Nancy's return to her family has been doubled by the FBI as pressure piles on her kidnappers, with the public being offered $100,000 to come forward with any relevant information.