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I'll point out a very important fact that will soon be lost with the anti gunner rhetoric. The single eyewitness (Glenn Willwerth) mentioned above who pointed out the black SUV was armed, and went outside to protect his employees. He didn't fire however, there was no clear target. He would have been limited though with the small magazine capacity, and evidently needed to retrieve the weapon first.

Whoever pulled the fire alarm should not have done that, but it could have been one of the perps.