Well, I have read that people almost always think that when glass breaks with an explosion that it blows up from the inside. I don’t think so in this case. While I am skeptical of the authorities and their constant PC spin, accounts I’ve read say that it did not come from inside the building.
Interesting, honestly I haven’t read much into this attack but heard yesterday on the radio that one of the bombs came from inside a hotel. Maybe after the explosion a vacuum is created and windows being broken from flying debris get sucked outward?