Pima County Sheriff Chris Nanossays investigators are 'close' to finding out what happened to Nancy Guthrie, the 84-year-old mother of Today host Savannah Guthrie, who vanished from her home near Tucson, Arizona, almost 100 days ago.

Nancy Guthrie disappeared on 1 Februaryfrom her home in the Tucson area in a case authorities have long treated as a suspected abduction. Investigators found drops of her blood inside the house, along with her mobile phone and the heart medication she is supposed to take daily. Despite a national appeal led by her television-star daughter and a reward now worth more than $1.2 million (£888,720), there has been no confirmed sighting, no named suspect and no clear indication of whether she is still alive.

The latest sign of movement came on Saturday, whenFox Newsreporters approached Nanos outside department headquarters and asked whether his team was close to solving Nancy Guthrie's disappearance.

'We are,' Nanos replied, before walking on without further comment.

In a case publicly quiet for weeks, the remark drew immediate attention. The sheriff's office has not expanded on his remark.The Independent reportedthat its request for further information from the Pima County Sheriff's Office had not yet received a response.

Officially, the known facts remain limited. Nancy Guthrie left no note, and there has been no confirmed sighting since the night of 31 January. Authorities have acknowledged traces of blood inside her home, but have not said how much was found. Detectives have said they believe she was taken 'against her will', but they have not publicly explained what led them to that conclusion beyond the physical evidence left behind.

So far, investigators have given no public indication of a breakthrough in the form of a person of interest, an arrest, or the discovery of a vehicle or personal belongings away from the property. They have also stressed that there is no evidence confirming whether Nancy Guthrie is dead or alive. Until the sheriff's office or the FBI provides more details, the meaning of Nanos's remark remains unclear.

While the investigation has largely faded from public view, the family's effort to keep Nancy Guthrie's case in the spotlight has continued.

On Sunday, nearly 100 days after her mother vanished, Savannah Guthrie posted a montage of photos and video clips onInstagram. Alongside the post, she described her mother as 'Mother, daughter, sister, Nonie' and wrote that the family missed her 'with every breath'.

'We will never stop looking for you. We will not be at peace until we find you,' Savannah wrote, before appealing directly to the public.

Source: International Business Times UK