US TV host Savannah Guthrie has posted a video message on social media saying, "we still have hope" - and urging whoever has her mother or knows of her whereabouts "to do the right thing".

"It's been two weeks since our mom was taken," Guthrie said in the video posted on Sunday night.

"And I just wanted to come on and say that we still have hope. And we still believe."

"I wanted to say to whoever has her or knows where she is that it's never too late," she continued.

"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. And it's never too late."

The video came hours after the FBI announced a glove appearing to match those worn by a masked person seen outside missing Nancy Guthrie's home had been found two miles away.

The glove, which contains DNA samples, was found in a field near the side of the road and has been sent off for testing.

The FBI said it had received preliminary results on Saturday and was awaiting official confirmation.

Initial reports suggest the glove appears to match those worn by a masked individual seen outside Ms Guthrie's front door the night she vanished.

The 84-year-old was last seen at her Arizona home on 31 January and was reported missing the following day.

Authorities say her blood was found on the front porch.

Read more: What we know about disappearance of TV host's mother

The FBI said it had collected DNA from Ms Guthrie's property, which does not belong to the missing OAP, nor those in close contact with her.

Supposed ransom notes have been sent to news outlets, but two deadlines for paying have passed.