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President Obama sends a letter to Iran's Supreme Leader seeking cooperation against ISIS. Jim Sciutto reports.
CNN's Nick Paton Walsh takes a look at how ISIS is using media to desensitize children.
Officials are concerned members of the Khorasan Group survived and are plotting against the U.S. Barbara Starr has more.
400 Sunni tribesmen who had taken up arms against ISIS, were killed in the last 48 hours according to tribal leaders. Jim Sciutto reports.
Republican Sen. Saxby Chambliss says ISIS carries out their threats, and killing them is the only option U.S. has.
ISIS is allegedly using chemical weapons in Syria and Iraq, but U.S. officials have not confirmed these reports.
CNN's Ivan Watson profiles an American solider fighting with a Kurdish militia against ISIS forces in Syria.