Stop lying. Absolutely no one reported a series of explosions followed by the collapse of the building. See, that last part is important. In your world, the Impossibly Vast Conspiracy rampages aimlessly, strewing clues all over the landscape while accomplishing nothing. Here on Earth, real people working at real jobs do things for a purpose. Demolition professionals, for instance, set off their charges to bring down buildings. They don't merely enjoy the sounds of explosions. So, it goes something like this: a series of explosions near the base of the building, then the building falls down, AND it isn't supposed to damage any nearby buildings.