"Just thinking about 50-60 Kg's of man portable go-boom."
You're not familiar with the area. Try more like a couple of kilos, max, I'd guess. From what I understand, there is no damage to the building, GL Cross Hall, and the photos show no damage to the buses. I'll know more tomorrow, when I walk by there on my way to class. The entrance to the parking garage is about (maybe) a hundred yards from Cross Hall, distance to the street, where the buses park is maybe 20 yards, in a straight line. Depending on where the buses in question were (and they park all along the street) gives you a pretty good limit on the size of the device.
Just a thought. What if he was unwittingly/unsuspectingly carrying an explosive device planted by someone else in a backpack left unattended for a short period of time and was followed and the device detonated by whomever followed? Conjecture only....
"I'll know more tomorrow, when I walk by there on my way to class."
I'm sorry that you have to experience that. Sad FRegards....
An uninformed opinion is that the detonation device functioned, yet the main charge failed. The sequence and planned timing is still unknown. Occaisonally, the "environmentals" do not go as planned. Anybody that was on this knotheads friends and family plan can look forward to a little extra scrutiny :)