Nigerian military announce Boko Haram peace truce - Can the girls be saved?

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After years of bloodshed with thousands dead and multiple kidnappings - today Nigeria's Army Chief of Staff announced a ceasefire between the army and Boko Haram. How likely is this? And what does this mean for the possible release of the kidnapped schoolgirls? One report says the 219 girls abducted in April will be released next week.