The FBI is still analysing what investigators have described as 'potentially critical DNA' at its lab in Quantico, Virginia, as the search for missing Arizona grandmother Nancy Guthrie reached the 100-day mark on Tuesday. Guthrie, 84, the mother of Today presenter Savannah Guthrie, disappeared from her home near Tucson in the early hours of 1 February, and no suspect has been publicly identified.
The case has drawn sustained attention in the United States because of both the mystery surrounding her disappearance and her daughter's public profile. The Pima County Sheriff's Department initially sent DNA evidence collected from Nancy's home to a private laboratory in Florida. Weeks later, local authorities transferred the material to the FBI crime lab in Quantico, where testing remains under way, according to CBS News.
