IS releases video of Germany train attacker making threats

The Islamic State group Tuesday released a video purportedly showing the Afghan refugee who slashed people on a German train saying he would carry out the attack and threatening "infidel" countries. The video released by IS's affiliated Amaq news agency, subtitled in Arabic, shows teenager "Mohammed Riyadh" -- knife in hand -- announcing in Pashto he would carry out an "operation" in Germany, and presenting himself as a "soldier of the caliphate". Amaq had earlier said the assailant who seriousl