New Delhi, Feb. 24 -- New development in Nancy Guthrie's abduction case suggests that the masked man might have visited her front door earlier than the night it is believed that she was kidnapped. Sources familiar with the probe informed ABC News that the suspect might have been surveilling the surrounding area before the suspected abduction on February 1.

The Federal Bureau of Investigation (FBI) released images of the suspect seen at Nancy Guthrie's door prior to her disappearance. The investigating agency asked neighbours to review their security footage from January 1 onward as they work to identify the suspect of "Today" show host Savannah Guthrie's mother's disappearance.

Residents were asked to identify suspicious people and vehi...