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US President Barack delivers a prime time address from the Cross Hall of the White House on September 10, 2014 in Washington, DC.  Vowing to target the Islamic State with air strikes "wherever they exist", Obama pledged to lead a broad coalition to fight IS and work with "partner forces" on the ground in Syria and Iraq.  AFP PHOTO/POOL/Saul LOEB        (Photo credit should read )
US President Barack delivers a prime time address from the Cross Hall of the White House on September 10, 2014 in Washington, DC.  Vowing to target the Islamic State with air strikes "wherever they exist", Obama pledged to lead a broad coalition to fight IS and work with "partner forces" on the ground in Syria and Iraq.  AFP PHOTO/POOL/Saul LOEB        (Photo credit should read )

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Obama: We will hunt down terrorists

President Obama addresses the nation and explains the U.S. strategy against ISIS.

Obama: We will hunt down terrorists

President Obama addresses the nation and explains the U.S. strategy against ISIS.