The "Transformers: Age of Extinction" director and his crew are scheduled to wrap in Chicago this week, but not before filming what one source with the production called the "mother of all bombs." The source said the explosion will take place Wednesday afternoon around the silos on S. Damen Avenue and W. 29th Street in the Pilsen area. This is the same site where "Transformers" recently blew up a bridge, while at the same time setting off an impressive fireball.