A senior Hamas official has told the BBC they have agreed to the Board of Peace's plan. Israel has not commented.
A hair sample found at the home of Nancy Guthrie came back inconclusive after undergoing testing, Pima County Sheriff Chris Nanos revealed Thursday.
There was no immediate comment from Hamas or Israel, and officials gave few details on the plan.
Nearly six months after Nancy Guthrie was kidnapped from her home in Tucson, Arizona, Jonathan Vigliotti sat down with the sheriff at the forefront of the investigation.
Obscure removal court hears first-ever case
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