Look under "Bombs!Bombs!" in the article - Felipe David - burned beyond recognition from the second explosion on level 1 of the basement.The article states that the first series of explosions occurred 7 - 8 seconds before the first plane hit...Rodriguez heard and felt at least three explosions going off in the basement levels within seconds of each other.
Also under the heading,'The 9/11 Commission Hearing',...'He explained in great detail to the Commissioners the numerous cases of serious injuries he had personally witnessed that were caused by these explosions.'
Also worth considering how it was that an elevator in the South Tower exploded about ten minutes before the second plane hit.
