This image made from video posted on the Internet by Islamic State militants and provided by the SITE Intelligence Group, a U.S. terrorism watchdog, on Saturday, Sept. 13, 2014, purports to show British aid worker David Haines before he was beheaded. The video emerged hours after the family of Haines issued a public plea on Saturday urging his captors to contact them. The 44-year-old Haines was abducted in Syria in 2013 while working for an international aid agency. (AP Photo)
This image made from video posted on the Internet by Islamic State militants and provided by the SITE Intelligence Group, a U.S. terrorism watchdog, on Saturday, Sept. 13, 2014, purports to show British aid worker David Haines before he was beheaded. The video emerged hours after the family of Haines issued a public plea on Saturday urging his captors to contact them. The 44-year-old Haines was abducted in Syria in 2013 while working for an international aid agency. (AP Photo) ASSOCIATED PRESS
This image made from video posted on the Internet by Islamic State militants and provided by the SITE Intelligence Group, a U.S. terrorism watchdog, on Saturday, Sept. 13, 2014, purports to show British aid worker David Haines before he was beheaded. The video emerged hours after the family of Haines issued a public plea on Saturday urging his captors to contact them. The 44-year-old Haines was abducted in Syria in 2013 while working for an international aid agency. (AP Photo) ASSOCIATED PRESS

Islamic State executes British aid worker, threatens another

September 13, 2014 09:15 PM

UPDATED June 17, 2015 01:47 PM

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