The FBI arrested someone posing to be involved in the kidnapping of Savannah Guthrie's mom, Nancy Guthrie, as the search for the 84-year-old continues. "We have made one arrest related to an imposter ransom demand, and a complaint will be presented to a magistrate judge later today," FBI Phoenix Special Agent in Charge Heith Janke said during a press conference on Thursday, February 5. "You will get more on that from the FBI and our U.S. Attorney's office here in Arizona when it becomes available." He added, "There's no evidence to connect this to Nancy's case. It was someone that was trying to profit off it." Savannah Guthrie and mother Nancy Guthrie. Nathan Congleton/NBC via Getty Images He also made a pointed request to anyone who might be planning to claim they are involved as a way to reap the $50,000 reward. (Janke noted that any action about a possible ransom will be decided by the Guthrie family.) "My next message is to those imposters who are trying to take advantage and profit from this situation. We will investigate and ensure you are held accountable for your actions," Janke continued, "This is an 84-year-old grandma that needs vital medication for her well being. You still have the time to do the right thing before this becomes a worse, much worse scenario for you." News broke on Sunday, February 1, that Savannah's mother had gone missing in Arizona. Pima County Sheriff Chris Nanos said during the same press conference on Thursday that he believes Nancy "is still out there" amid her disappearance. "We want her home," he added. "I really want you to know, this entire team here, those behind me, and our community, are hurting with you." Sheriff Clarifies Timeline, More Key Details in Nancy Guthrie Disappearance Nanos made it clear that no suspect has been named as the investigation continues. "I know there's been a lot out there about suspects and I want to be very clear," he said. "At this time, we have not identified a suspect or a person of interest in this case. We're not there yet." Nanos also made it clear that "every single lead" is being looked into. Everything to Know About the Ongoing Search for Nancy Guthrie The press conference comes hours after Savannah, along with her sister, Annie Guthrie, and brother, Camron Guthrie, presented a united front in a video shared via social media "On behalf of our family we want to thank all of you for the prayers for our beloved mom, Nancy. We feel them and we continue to believe that she feels them too," Savannah said, in part. "Our mom is a kind, faithful, loyal, fiercely loving woman of goodness and light. She is funny, spunky and clever. She has grandchildren who adore her and crowd around her and cover her with kisses. She loves fun and adventure. She is a devoted friend. She is full of kindness and knowledge. Talk to her and you'll see." They also addressed the alleged ransom note that was sent to a local news outlet regarding Nancy's disappearance. "As a family, we are doing everything that we can. We are ready to talk. However, we live in a world where voices and images are easily manipulated," she said. "We need to know without a doubt that she is alive and that you have her. We want to hear from you, and we are ready to listen. Please, reach out to us."