Authorities investigating the kidnapping of Nancy Guthrie intensified their search efforts Friday, blocking off a road near the victim’s neighborhood and detaining three people during a SWAT operation.

One of the men was later released after investigators determined he was not involved, and no arrests have been made.

The Pima County Sheriff’s Department confirmed on social media that law enforcement activity was underway at a residence near East Orange Grove Road and North First Avenue, a short distance from Guthrie’s home.

“Law enforcement activity is underway at a residence near E Orange Grove Rd & N First Ave related to the Guthrie case,” the department posted.

“Because this is a joint investigation, at the request of the FBI — no additional information is currently available.”

Multiple agencies, including the FBI, sheriff’s deputies, and SWAT officers, were seen surrounding the area after investigators reportedly acted on a tip.

Sources close to the investigation said authorities detained and questioned three individuals but did not make any arrests.

One of the detained individuals was released after police determined he was not involved in the kidnapping.

“The man was cooperative,” sources said.

Nancy Guthrie, 84, the mother of “Today” co-host Savannah Guthrie, was reported missing earlier this month after family members said she suddenly disappeared from her Tucson home

Investigators have said the case is being treated as a kidnapping and continue to track leads while collecting evidence from the scene.

The investigation has drawn national attention, with the FBI assisting in the case and authorities urging anyone with information to come forward.

Officials have not disclosed further details about Friday’s operation, citing the ongoing nature of the joint investigation.

Authorities investigating the disappearance of Nancy Guthrie intensified their search efforts late Friday night after law enforcement blocked off a road near the victim’s neighborhood and detained three people during a SWAT operation.

The Pima County Sheriff’s Department confirmed on social media that law enforcement activity was underway at a residence near East Orange Grove Road and North First Avenue, a short distance from Guthrie’s home.

“Law enforcement activity is underway at a residence near E Orange Grove Rd & N First Ave related to the Guthrie case,” the department posted early Saturday morning.

“Because this is a joint investigation, at the request of the FBI — no additional information is currently available.”

Multiple agencies, including the FBI, sheriff’s deputies, and SWAT officers, were seen surrounding the area after investigators reportedly acted on a tip.

Local reports indicated three individuals were detained during the operation, though authorities have not confirmed whether any arrests were made or whether the people detained are suspects.

Nancy Guthrie, 84, the mother of Today co-host Savannah Guthrie, was reported missing earlier this month after family members said she suddenly disappeared from her Tucson home.

Investigators have said the case is being treated as a kidnapping and have been working to track down leads while collecting evidence from the scene.

The investigation has drawn national attention, with the FBI assisting in the case and authorities urging anyone with information to come forward.

Officials have not disclosed further details about Friday’s operation, citing the ongoing nature of the joint investigation.