Authorities have begun collecting DNA samples from workers employed around Nancy Guthrie’s residence in Arizona, as the search for her daughter, Savannah’s mother, intensifies.

This development suggests that investigators may have discovered DNA evidence either inside the house or at the crime scene. These samples are being gathered to potentially rule out individuals as suspects or to provide a clearer understanding of the events that transpired, as reported by Fox News.

Since the 84-year-old woman’s disappearance was reported on February 1, law enforcement officials have emphasized their commitment to thoroughly investigating all possible leads and considering everyone a potential suspect.

On Tuesday, the FBI released unsettling images showing a masked individual, believed to be armed, at Nancy’s doorstep.

According to police, the suspect appeared to interfere with the surveillance camera on her front porch.

“We’re actively examining every person involved in this case. It would be irresponsible of us not to speak with everyone,” stated Pima County Sheriff Chris Nanos during a press conference held on February 5.

Nanos also confirmed that cops talked to the Uber driver who drove Nancy to her daughter Annie Guthrie and husband, Tommaso Cioni’s Tucson, Ariz., home for dinner the evening of her disappearance.

“It’s so cliché, but everybody’s still a suspect in our eyes. That’s just how we look at things and think as cops. Does that mean we have a prime suspect? No,” Nanos explained, adding that “the family’s been very cooperative” and “done everything” asked of them.

During a press conference on Feb. 3, FBI Phoenix special agent Heith Janke confirmed the existence of a ransom note with two deadlines. The first deadline was set for Feb. 5 at 5 p.m. local time, while the second was set for Feb. 9 at 5 p.m.

TMZ founder Harvey Levin revealed the chilling threat the suspected kidnappers made in their ransom note sent to the outlet.

“I’ll read you one line from the ransom note we received,” Levin told CNN Monday. “And they say, ‘It is in the best interest of everyone to have this completed as soon as possible.’

“This was way back when the first ransom note was issued.”

The legitimacy of the message has not yet been verified and sources tell Page Six the family still has not been given any proof of life.

Savannah and her siblings have issued several desperate pleas on social media to Nancy’s alleged kidnappers — offering to pay the ransom in one of them.

However, as of Monday, the ransom remains unpaid.