UP 10/04/14

David Cameron vows to defeat ‘ruthless, senseless, and barbaric' ISIS

A new video from ISIS seems to show the beheading of a British aid worker and threatens to kill an American who was taken hostage in Syria. NBC’s Richard Engel reports from Istanbul, Turkey and Steve Kornacki discusses with Al-Arabiya’s Hisham Melhem. ... more Duration: {{video.duration.momentjs}}