FBI’s search for Nancy Guthrie has few leads, with potential break in the case fizzling

Eleven days after the mother of “Today” show host Savannah Guthrie vanished from her home in the foothills outside Tucson, Arizona, investigators had yet to identify a suspect or even a person of interest Wednesday.

What seemed like a major break Tuesday — when authorities detained a person for questioning — fizzled when the man was released hours later. The detainment followed another potential break earlier in the day when investigators released video footage showing a masked and apparently...