The Arizona sheriff in charge of the Nancy Guthrie investigation revealed he believes he knows why the 84-year-old was “targeted” — while warning that the suspect “absolutely” could strike again.

Pima County Sheriff Chris Nanos, who has faced criticism over the fruitless month-long search for Guthrie, gave the update while refusing to divulge details, even as he suggested others are not “safe.”

“We believe we know why he did this, and we believe that it was targeted, but we, we can’t, we’re not 100% sure of that,” Nanos told NBC News Thursday night.

“So it’d be silly to tell people, ‘Yeah, don’t worry about it. You’re, you’re not his target.’ Don’t think for a minute that because it happened to the Guthrie family, you’re safe. No, keep your wits about you.”

He declined to give any further details on the case or theories surrounding Guthrie’s Feb. 1 disappearance.

It comes as the search for “Today” show co-host Savannah Guthrie’s mom neared its sixth week — with zero leads.

Nanos, for his part, has been accused of making confusing and contradictory public statements earlier in the investigation.