Yahoo Canada News - "HORRIBLE PHOTOS reveal ISIS marched 21 Coptic Christians to beach, beheaded them all" Image via Twitter/ @trscoop / The Right Scoop CAIRO (Reuters) - Islamic State released a video on Sunday purporting to show the beheading of a group of Egyptian Christians kidnapped in Libya, violence likely to deepen Cairo's concerns over security threats from militants thriving in the neighboring country's chaos. Egypt's state news agency MENA quoted the spokesman for the Coptic Church as confirming that 21 Egyptian Christians believed to be held by Islamic State were dead. In the video, militants in black...