I believe the first part.

Michael Bay is delivering his wrath upon Chi-Town. The Chicago Tribune put together an extensive gallery of pics from the set of Transformers 3, which is currently filming around LaSalle Street in downtown Chicago. The term "Windy City" gets a whole new meaning as natural gusts are replaced with violent releases of pressure from the many explosions Bay will set off around the area. Some are for the movie, others are just for shits and giggles.

Check out video and more pics from the set after the jump... 


(Video via ComingSoon)