A parade of sheriff's and FBI vehicles, including forensics vehicles, passed through the roadblock that was set up about three kilometres from the house on Friday night.
The two agencies also tagged and towed a Range Rover SUV from a Culver's restaurant parking lot. The restaurant is just over three kilometres from Nancy Guthrie's home. This activity took place at the same time the sheriff's office closed a road just north of the Guthrie home.
The Pima County Sheriff's Department confirmed on Saturday that a federal court-ordered search warrant was executed at the home Friday in connection with the Guthrie case. The warrant was based on a lead the agency had received. No arrests were made.
A traffic stop was also conducted, and while someone was questioned, no arrests were made, the sheriff's office said.
No additional information was released on Saturday.
Guthrie, 84, was reported missing on February 1. Authorities say her blood was found on the front porch of her Tucson-area home. Purported ransom notes were sent to news outlets, but two deadlines for paying have passed.
Authorities have expressed concerns Guthrie's health because she needs daily medication. She has a pacemaker as well as high blood pressure and heart issues, according to sheriff's dispatcher audio on broadcastify.com.
Investigators have studied surveillance video, sorted through thousands of tips and submitted DNA and other evidence for laboratory analysis.
The FBI said it has collected more than 13,000 tips since and the sheriff's department has taken at least 18,000 calls.
On Tuesday, authorities released footage showing an armed, masked person at Guthrie's doorstep on the night she was abducted.
The videos gave investigators and the public their first glimpse of who was outside Guthrie's home in the foothills outside Tucson.
Experts say the video could contain a mountain of clues.
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