A Roman-built ampitheatre has been used for the public execution of captured prisoners of war before an audience for the first time in perhaps 1,500 years, after ISIS forces captured the classical ruins at Palmyra last week. The Syrian Observatory for Human Rights reports twenty prisoners, thought to be captured Syrian soldiers who had attempted to defend the ancient city from the Islamic State, were put to death before an audience of militants and locals. The observatory reports the ampitheatre dead were just a few of the near-70 executed in the area so far, on suspicion of being enemy forces,...