According to details given int the latest press briefings by officials, the first LEOs on the scene of the shooter's room were met by gunfire from inside the room; not knowing exactly how many or how well armed the shooter or shooters may have been, they fell back until SWAT could respond. Additionally, reports have said fertilizer compounds of the sort used to make IEDs were found in the car of the suspect, so maybe the LEOs were concerned someone who seemed to be so well prepared and armed might also have taken contingency action by setting up IEDs or other booby traps; such traps are often used by terrorists to inflict harm to first responders; remember, when the LEOs went to the shooters floor, they didn't know if it was actual organized terrorism or a lone whacko; either way, you have to be ready for the worst...
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