The FBI spent several hours at Nancy Guthrie’s Arizona home on Wednesday, conducting one more sweep for evidence before deciding whether her family can return to the property, sources told The Post.

The development signals that the investigation into the 84-year-old’s abduction is at a standstill as she’s now been missing for 25 days and authorities have yet to identify any suspects in the baffling case.

The feds arrived at Guthrie’s Tucson house on Wednesday morning, spending more than two hours at the million-dollar property.

Sources told The Post that they were likely looking for any last pieces of evidence that may have been overlooked before opening the house back up to the Guthries.

Guthrie – the mom of “Today” show host Savannah Guthrie – was reported missing on Feb. 1 after she didn’t show up at church.

Security footage recovered from Guthrie’s doorbell camera captured a masked man–or two different men, as some theorists speculated–loitering on her doorstep the night police believe she was kidnapped.

The man, seen wearing a black Ozark Trail Hiker backpack, tried to cover up the camera with branches, according to the footage.

The next morning, Feb. 1, Guthrie was reported missing.

Neighbors in her Catalina Hills community later claimed they saw a suspicious young man lingering around the street near Guthrie’s home in the weeks leading up to her disappearance.

Sources told ABC News last week that the case was slowly shifting to a smaller long-term task force model after police’s prime leads came up empty.

But the Pima County Sheriff’s Department separately told The Post that 300 to 400 personnel remain assigned to the case and that staffing levels were the same as when the investigation began.

A laundry list of evidence recovered at the home, including traces of blood, are still being investigated, but Pima County Sheriff Chris Nanos warned that it could take up to “a year” to analyze it all, especially contents with traces of DNA.