The Obama administration is condemning the video which reportedly shows the execution of the fourth hostage held by the Islamic State jihadis.
Alan Henning was kidnapped in December as he was volunteering as an aid worker in Syria.
Lisa Monaco is U.S. President Barack Obama's top aide on counter-terrorism.
IN: "We are...
OUT: ...destroy ISIL."
DUR: 40
ISIL is the Islamic State of Iraq and the Levant, the term often used by the Obama administration.
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