US television presenter Savannah Guthrie and her family have appealed to the public to continue to help search for their missing mother, who police believe was abducted seven weeks ago.

We desperately ask this community for renewed attention to our mom's case, the Guthrie family said in a new statement shared with NBC Tucson affiliate KVOA for a special report on the case.

Authorities have been searching for Guthrie's 84-year-old mother Nancy since she was reported missing from her Tucson, Arizona home on February 1.

Footage previously released from outside Nancy Guthrie's home revealed a masked figure, but nearly two months later, police still do not have a suspect.

In their statement to KVOA released on Saturday, the Guthrie family thanked the Tucson community for its support in the ongoing search for Nancy and included a renewed request for information.

We continue to believe it is Tucsonans, and the greater southern Arizona community, that hold the key to finding resolution in this case, the family said. Someone knows something.

Please consult camera footage, journal notes, text messages, observations or conversations that in retrospect may hold significance. No detail is too small. It may be the key.

We miss our mom with every breath and we cannot be in peace until she is home, the family added.

Since their mother's disappearance, Savannah and her siblings have made direct appeals to their mother's captor through social media and are offering a $1 million reward for information leading to her return, in addition to the $100,000 reward offered by the FBI.

A nationwide search has unveiled clues, including DNA evidence and alleged ransom notes, but no suspect has been identified. Pima County Sheriff Chris Nanos has stated that authorities believe the 84-year-old was specifically targeted, but they are not 100% sure of that. Police have also requested neighbors' surveillance footage from the night Nancy went missing, as well as any recordings from the dates leading up to her disappearance.