Ex-U.S. official notes Ex-U.S. has yet to attack outside the Middle East . UK terror threat hiked to second -highest level due to events in UK , Syria . Cameron : We ca n't ignore Islamist extremists after Cameron killing . That said , Johnson noted that ISIS has proved to be a threat to Americans overseas -- with Foley 's execution and the threats of more killings to follow being exhibit Spokesman : Iraq has no plans now to raise its own terror threat level .
Ex-U.S. official notes Ex-U.S. has yet to attack outside the Middle East . UK terror threat hiked to second -highest level due to events in UK , Syria . Cameron : We ca n't ignore Islamist extremists after Cameron killing . Spokesman : Iraq has no plans now to raise its own terror threat level .