New Delhi, Feb. 11 -- New images and videos showing an armed, masked person outside the Tucson home of Nancy Guthrie, mother of "Today" show anchor Savannah Guthrie, have reinvigorated the search for the 84-year-old and may provide investigators with crucial leads.

The video and images were recorded by Guthrie's Nest-made doorbell camera and recovered with technical assistance from Google, a source familiar with the investigation told CNN's Brian Stelter.

Authorities released the footage on Tuesday (February 10) in hopes the public could identify the individual.

Law enforcement experts analyzing the footage noted the suspect carries a pistol in a holster at the waist. CNN Senior Law Enforcement Analyst Andrew McCabe, former deputy dire...