I was told this by an FDNY member, over beers, that I met through my cousin, an NYPD officer.  I asked him about the videos showing reports of explosions and bombs, secondary devices.  He said there were rumors, it was total chaos, nothing reliable over the radio-- this was his exaggeration but it makes a point.  What answers do you want?  What is necessary to appease the conspiracists--they will always find something that provokes the accusations, it is what allows them to function.