Pima County Sheriff gives update on the investigation into the disappearance of Savannah Guthrie's mother Nancy

Police found "no evidence" the suspect visited Nancy Guthrie's home before the day of her disappearance.

The 84-year-old mother of Today show star Savannah Guthrie went missing near her home in Tucson, Arizona on February 1, and Pima County Sheriff Chris Nanos has dismissed reports that a masked man seen on doorbell camera footage was spotted at the house at an earlier date.

Nanos told PEOPLE magazine: "There is no evidence to support that… and there is no evidence to support it was all on the same day.

“It is speculative at best and remains part of an ongoing investigation.”

However, Nanos conceded that the masked suspect may have returned on a different day, as he's seen without a backpack or gun in one of the clips and photos shared by the FBI on February 10.

He added: “It could be accurate. We just don’t have evidence to support when each image was taken…

"There is no date or timestamp and we are still investigating it.”

In a separate statement, police reiterated that "conclusions will be guided by verifiable evidence" rather than speculation.

The Pima County Sheriff's Department commented: "We are aware that doorbell images released earlier in the investigation depict a suspect in different stages of attire, including with and without a backpack.

"There is no date or time stamp associated with these images. Therefore, any suggestion that the photographs were taken on different days is purely speculative.

"This remains an active and ongoing criminal investigation.