Two Britons and two American hostages have now been brutally decapitated by ISIS as they vow to continue the beheadings until their demands are met.  American Peter Edward Kassig is a former Army Ranger who was on a U.S. AID mission when he was captured.

CAIRO (AP) — An Internet video released Friday purports to show an Islamic State group fighter beheading British hostage Alan Henning.
The video mirrored other beheading videos shot by the Islamic State group, which now holds territory along the border of Syria and Iraq.  The video ended with an Islamic State fighter threatening a man they identified as an American.
“Obama, you have started your aerial bombard of Shams (Syria), which keep on striking our people, so it is only right that we strike the next of your people,” a masked militant said.
The Associated Press could not immediately verify the video’s authenticity, though it was released in the same manner as other Islamic State group videos.
This is the fourth such video released by the Islamic State group. The full beheadings are not shown in the videos, but the British-accented, English-speaking militant holds a long knife and appears to begin cutting the three men, American reporters James Foley and Steven Sotloff and British aid worker David Haines.
Henning, 47, nicknamed “Gadget,” had joined an aid convoy and was taken captive on Dec. 26, shortly after crossing the border between Turkey and Syria. (read more)