Eight months ago, on December 28, a warplane from the US-led coalition fighting the Islamic State, or ISIS, struck a building in the Syrian town of al-Bab that had been identified as a local headquarters for the militant group. It was just one of over a thousand airstrikes the coalition had launched up to that point. However, this building wasn’t simply a gathering place for militants or a storehouse for weapons. It was also being used as a makeshift prison for local civilians whom ISIS had accused of petty offenses like smoking cigarettes and wearing jeans.