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ISIS celebrates announcement of their "Caliphate."
Caption: 	This photo was tweeted from a Twitter account widely believed to belong to ISIS in Aleppo, Province, Syria. It purportedly shows celebrating ISIS' announcement of the so called Islamic Caliphate, spanning large areas of Iraq and Syria. The Islamic State in Iraq and Syria (ISIS) is a Sunni Muslim extremist group formerly linked to al-Qaeda-- al Qaeda has since denounced ISIS.
ISIS celebrates announcement of their "Caliphate."
Caption: 	This photo was tweeted from a Twitter account widely believed to belong to ISIS in Aleppo, Province, Syria. It purportedly shows celebrating ISIS' announcement of the so called Islamic Caliphate, spanning large areas of Iraq and Syria. The Islamic State in Iraq and Syria (ISIS) is a Sunni Muslim extremist group formerly linked to al-Qaeda-- al Qaeda has since denounced ISIS.

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NSA chief: New blind spots in tracking terrorists

The director of the National Security Agency speaks with CNN's Jim Sciutto about the problems his agency faces trying to track terrorists and combat cyber attacks.