Updated September 2, 2014 8:11 PM
By The Associated Press
EDS NOTE: GRAPHIC CONTENT - This image made from video posted on the Internet by Islamic State militants and provided by the SITEIntelligence Group, a U.S. terrorism watchdog, on Tuesday, Sept. 2, 2014, purports to show journalist Steven Sotloff before he was beheaded. Sotloff had last been seen in Syria in August 2013 until he appeared in a video released online by the Islamic State group on Aug. 19, 2014, that showed the beheading of fellow American journalist James Foley. The Arabic text at the bottom of the frame translates to "Now is the time for my message." (AP Photo) (Credit: AP)
(AP) -- Islamic State extremists released a video Tuesday purportedly showing the beheading of a second American journalist, Steven Sotloff, and warning President Barack Obama that as long as U.S. airstrikes against the militant group continue, "our knife will continue to strike the necks of your people."
The footage -- depicting what the U.S. called a sickening act of brutality -- was posted...
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