New Delhi, Feb. 12 -- A white forensic tent has been erected outside the Tucson, Arizona home of missing 84-year-old Nancy Guthrie, covering the front door and porch area where investigators previously found blood matching her DNA.

The tent has been placed at the same entrance where surveillance footage captured a masked individual wearing gloves approaching the house and attempting to disable the doorbell camera.

The development comes 11 days after Guthrie was allegedly abducted from her home in the early hours of February 1.

Law enforcement agencies typically set up forensic tents to shield sensitive evidence from public view and environmental contamination. Such tents are commonly used when:

-Processing potential bloodstain pattern...