There's some good reasons to believe the explosives that actually took down the building were strategically placed charges on the support columns themselves, which the wikitard article tries to avoid. One of the witnesses that fingered Andreas Strassmeir saw a trio of men placing what she called putty and wires in the building a couple days before. A local university seismograph registered three distinct events, which correlates with two detonations and the building collapse. There was debris scattered by an explosion that would have had to fly past the truck to get to the other side of the street, which would indicate it was thrown by a blast from within the building. Some columns nearest the truck were intact and the explosion miraculously wrapped around them to destroy other columns that were hidden behind them. And finally, the additional unexploded ordnance were most likely demo charges that were blown off by the other discrete charges due to improper timing.

Spez: There is also a good comparison to be made with the Khobar Tower bombing in Saudi Arabia. That attack used 5,000lbs of real deal plastic explosives in a more effective configuration against a similar sized structure that had far shoddier construction, and it still only blew off the front facade of the building.