Here's my pics: Flickr: EShadowP's Photostream A large portion of the filming was literally in front of the building I work in (including reducing the bus stop I wait at every day to charred rubble). Around the corner from that I got to see skydivers being filmed by the chopper camera as they leapt from the Sears Tower:
So, Prime has a flatbed trailer rigged with explosives, which will be used in post to actually blow up the trailer. Nice.