Bigger than a pipe bomb, smaller than a nuke.
I haven't seen anything related to the strength of that bomb in the news. In fact, the news will still lead you to think the motor home was the source of the bomb.
My opinion, FWIW, is that a small bomb may have been planted in the motor home as a decoy when the real bomb was at an underground level in the building itself.
Yours is a good opinion. Listen to the audio carefully for any video at the time of the blast. There are distinctly two concussions. This is especially noticeable in the video where the officer goes around the corner to his right, walks a block to his car, starts to put on a vest and ... ba boom.
Audio experts told me the modulated volume level control may have cut the recording but doubt it could record, cut and continue recording and give the two concussion results. They are looking at the audio traces.
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