When Hamas attacked Israel just over two weeks ago, it took more than 200 hostages back to Gaza.

As Israel continues to plan for a ground invasion of the Palestinian territory, the Islamist militant group has released a mother and daughter and two elderly women. 

Today, Dani Gilbert, expert in hostage taking and recovery from Northwestern University in Illinois, on how their freedom was negotiated and whether more hostages can be saved.    

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Danielle Gilbert, Assistant Professor of Political Science, Northwestern University