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Investigators found DNA in the home of Nancy Guthrie, the missing mother of American news anchor Savannah Guthrie, that did not belong to her or her relatives, local officials said.
The Pima County Sheriff’s Department said it was working to identify who the DNA belonged to, but would not release its whereabouts.
Investigators also found several gloves, with the closest found about two miles from Nancy Guthrie’s home.
The 84-year-old disappeared in the middle of the night from his home in Tucson, Arizona, almost two weeks ago. Authorities believe she was taken against her will.
The sheriff’s department said reports that a glove was found inside his home or on the property were inaccurate.
All evidence collected has been sent for laboratory analysis, they added.
He said investigators were able to establish identifying details about the suspect after analyzing footage from a doorbell camera outside Guthrie’s home.
The suspect was carrying a 25-liter Ozark Trail Hiker Pack backpack in the footage, the FBI said.
After the doorbell images were broadcast, investigators received more than 13,000 tips, including 4,000 in 24 hours.
The FBI also increased the reward for information on Guthrie’s disappearance from $50,000 (£36,700) to $100,000.
The county sheriff’s department said describing the suspect “remains a priority,” adding, “However, investigators are not ruling out any individuals or possibilities.”
Investigators also made a broader appeal for video footage from Guthrie’s neighbors.
Police said Nancy Guthrie, 84, required medication daily and had limited mobility.
Savannah Guthrie and her two siblings posted a number of messages on social media aimed at their mother’s kidnapper.
They believe she is still alive and have indicated they would be willing to pay for her safe return.
