Cops Deny Report Claiming Savannah Guthrie's Brother-In-Law 'May Be' a Suspect

6:55 AM PT -- No suspects have been identified in the ongoing investigation into the disappearance of Nancy Guthrie, the Pima County Sheriff's Department said Wednesday morning.

The department tells TMZ ... "We have not identified a suspect or person of interest in this case. Detectives continue to speak with anyone who may have had contact with Mrs. Guthrie. We are also awaiting additional forensic results."

They add, "We are not confirming the car being seized, we are unsure where that reporter is getting that information."

There's a potentially stunning twist in the kidnapping of 'TODAY' anchor Savannah Guthrie's mother Nancy ... an Ashleigh Banfield report claiming her son-in-law might be a suspect.

Banfield -- an independent journalist and former NewsNation host -- reported Tuesday night, a law enforcement source told her Tommaso Cioni has been identified by police as a possible suspect in the case.

Cioni is married to Savannah's sister Annie, and we know she was the last person to see Nancy on Saturday night when they reportedly had dinner together. It's unclear if Cioni was also at the dinner.

As you know, Nancy's family called police Sunday after they got word she didn't show up to her regular Sunday church service.

Now, Banfield reports investigators have towed Annie's car, which has "some connection" to 50-year-old Cioni. Banfield adds that all the cameras at Nancy's Tucson, Arizona home were smashed.

Tuesday, NewsNation published a video showing a trail of blood outside the front steps of Nancy's house. The Los Angeles Times reported Nancy's blood was found at the crime scene.

TMZ was sent an alleged ransom note from an unknown person or persons who demanded payment in exchange for Nancy's release. The Pima County Sheriff's Department and the FBI are investigating whether the note is authentic.

Police say Nancy was kidnapped from her home in the middle of the night -- sometime between Saturday night and Sunday morning. Investigators are working fast to find Nancy ... believing time is of the essence. She's 84, in poor health, and without her daily medication.