Federal investigators have contacted Mexican law enforcement as the search intensifies for Nancy Guthrie and the individual believed to have abducted her, widening the scope of an investigation that is now entering its third week.

According to law enforcement sources, authorities have broadened their efforts far beyond Tucson in recent days. At the same time, officials stressed there is no current indication that drug cartels are connected to the case.

The outreach to Mexico comes after a purported ransom letter claimed the 84-year-old mother of Savannah Guthrie is being held “south of the border,” according to TMZ, which obtained the message.

Guthrie disappeared from her Tucson, Arizona, residence on February 1. Her home is located roughly an hour from the Mexican border, fueling speculation that she may have been transported across the border after vanishing.

While the FBI has not publicly confirmed that agents are actively searching for her in Mexico, a person of interest was taken into custody and questioned in Rio Rico, a border community, on February 10.

That individual was later released without charges. Still, the detention signaled that investigators are examining the possibility that Guthrie may have been moved into Mexico shortly after her alleged abduction.

Surveillance footage from Guthrie’s property captured a suspect appearing to disable a security camera on the morning she went missing. The individual, wearing gloves and carrying a firearm, appeared to have facial hair visible beneath a full-face ski mask.

The investigation has also extended to local businesses. The FBI recently visited a gun shop in Tucson, where agents presented the owner with names and photographs of individuals who “looked Mexican,” Phillip Martin, the store’s owner, told The Post on Tuesday.

Martin said most of the approximately 20 people identified as persons of interest had brown complexions and facial hair consistent with the appearance of the masked suspect.

In the Tucson area, the case — spearheaded by the Pima County Sheriff’s Department with assistance from the FBI — has encountered repeated setbacks.

On the same day authorities made public the surveillance video, they detained a person of interest in Rio Rico. However, that man was freed in less than twelve hours without facing any charges.

Days later, a SWAT team executed a law enforcement operation at a home near Guthrie’s neighborhood, questioning multiple individuals. No arrests were made during that action.

Investigators also recovered a glove discarded near Guthrie’s residence that contained DNA believed to belong to a possible suspect. However, the sample did not match any profiles in the FBI’s national DNA database, suggesting it may not be linked to the crime.

On Wednesday, the Pima County Sheriff’s Department confirmed that a separate DNA sample collected from inside Guthrie’s home is now undergoing testing.

In addition, authorities have deployed a specialized “Bluetooth sniffer” device in hopes of detecting signals emitted by Guthrie’s pacemaker, an effort aimed at tracking her possible location through electronic means.