The search for Nancy Guthrie entered its third week on Sunday. Investigators haven’t yet named a suspect or made arrests in the case, as they field thousands of tips submitted after the FBI released surveillance images from Guthrie’s doorbell camera.

Authorities — including SWAT and forensics teams — swarmed a home on the edge of the Catalina Foothills neighborhood north of Tucson, Ariz., near Guthrie’s home, as it carried out a federal court-ordered search warrant. The Pima County Sheriff’s Department said Saturday that the warrant was “based on a lead we received” and that no arrests were made from that law enforcement activity.

Additionally, a person was questioned during a traffic stop on Friday night, but there weren’t any arrests from that either.

Sheriff Chris Nanos told the New York Times that DNA from someone other than Nancy Guthrie and those close to her was collected from Guthrie’s property, but would not disclose where it was located. Investigators are currently working to identify the DNA.

Authorities last week expanded their call for video of any “suspicious activity” from people within a 2-mile radius of the 84-year-old’s home. The sheriff’s department said that “several items of evidence, including gloves,” were recovered and are being submitted for analysis. It’s unclear whether authorities believe the gloves are the same as those worn by the person seen in the footage.

On Thursday afternoon, the FBI released a new description of the suspect based on forensic evidence from the doorbell camera. He is described as “approximately 5’9” – 5’10” tall, with an average build.” The agency also provided specific details of the backpack he is believed to have been wearing and announced that it was increasing its reward for information leading to Guthrie’s location to $100,000.

Officials said last week that they have received more than 18,000 tips since the investigation began, including over 4,000 since doorbell camera images of what the FBI described as “an armed individual” on the morning of her disappearance were released.

Guthrie, the mother of Today show cohost Savannah Guthrie, was last seen at around 9:45 p.m. on Jan. 31, when she was dropped off at her home by family members following dinner, police said. She was reported missing around noon the next day after she did not show up at a friend’s house to watch an online church service.

Anyone with information is encouraged to reach out to the Pima County Sheriff’s Department tip line at 520-351-4900 or the FBI tip line at 1-800-CALL-FBI.

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