One interview I heard from a witness said there were multiple gun fire exchanges , first about 3 or 4 shots, then an exchange of half a dozen or more, then a full on barrage of gun fire, Also, another vid I saw was what looked like and energetic stream of some kind going right up above the buildings just seconds before the blast. Here is my take, The RV bomb was intended to cover up the real operation that took place. I'm thinking Chinese or Moassad dirty nuke going off on Christmas intended to knock out internet and power for vast sections of the south. The white hats new about , shot and killed them trying to pull it off and used directed energy weapon to make sure the nuke was evaporated, the RV bomb with loud speaker announcement of everyone to clear the area forced police to respond and clear residents so no lives would be lost, then the RV was detonated to cover up for the DEW strike on the terrorist device/devices and team. Just a theory based on a whole lot of crumbs.