On July 3, 292 Iraqis lost their lives in ISIS’ deadliest attack thus far. In a crowded street in Baghdad’s Karrada neighbourhood, a vehicle-borne improvised explosive device (VBIED) was detonated after midnight, causing nearby dwellings to be engulfed in flames. Many residents were trapped inside the inferno and burned to death — it was estimated that merely 20 to 30 people had perished from the initial explosion. But investigators at the scene are now concerned with another potential threat: A new type of bomb may have been developed and used by the terrorist group. “We’ve never seen it before, and...