Nancy Guthrie update: Search for Savannah Guthrie's missing mother enters seventh week with no arrests

Savannah, who skipped NBC's Olympics coverage to spend time with her family during the search effort, still hasn't returned to work, although she visited her colleagues earlier this month after returning to New York from her native Tucson.

Her mother is believed to have been abducted from her longtime home in the Catalina Foothills, an upscale suburban neighborhood in northern Tucson, in the early hours of Feb 1.

"We believe that it was targeted, but we can't - we're not 100% sure of that," he said. "And so it would be silly to tell people, 'Yea don't worry about it. You're not his target.' No, you could be."

Investigators said previously that the victim's pacemaker last synced via Bluetooth around 2:30 a.m. the night she went missing. They found blood drops on her front porch, leading to the driveway, where the trail stopped.

Federal law enforcement sources previously told Fox News Digital it provided only a partial profile that was insufficient for the FBI's CODIS database of known offenders as well as investigative genetic genealogy techniques.

Authorities said last week they had looked into the box and ruled it out.

There's a combined reward of over $1.2 million for info that cracks the case.