United Kingdom, Feb. 19 -- The Nancy Guthrie reward money has been doubled as the search for Savannah Guthrie's missing mom continues.

The TV presenter's 84-year-old mother, Nancy Guthrie, disappeared from her Arizona home on February 1 prompting an investigation by officials at the FBI and the Pima County Sheriff's Department - and now it's been revealed there has been a significant increase in the reward for information leading to Nancy's location or the arrest and conviction of anyone involved in her disappearance.

The 88-CRIME tip line has received a $100,000 pledge from an anonymous donor to bring the total reward money to $102,500 in addition to the $100,000 which is being offered by the FBI.

It comes as Pima County Sheriff Chris...