India, May 28 -- More than 100 days have passed since Nancy Guthrie, the 84-year-old mother of Today anchor Savannah Guthrie, was taken from her Tucson, Arizona home in the early hours of February 1. With the official investigation appearing to stall, Savannah has poured around $500,000 of her own money into a private search effort and shows no signs of stopping.

According to The US Sun, a source close to the family said Savannah "has told everyone involved that the search will continue for as long as necessary." The insider added: "She is not prepared to stop looking for her mother. She feels that depending only on the official investigation is not enough anymore- that's why she's investing so heavily in private investigators and outsid...