The FBI said Sunday that the shooter acted alone.
The first three shots were consistent with a suspected weapon A, the next five were consistent with a suspected weapon B, and the final “sonic boom” was from a possible weapon C, according to audio analysis by Catalin Grigoras, director of the National Media Center Forensic Science Update at the University of Colorado at Denver and Cole Whitecotton, Senior Professional Research Associate at the same institution.
The audio analysis also confirmed that the gunman was regarding 360 to 393 feet from the podium, according to special medical examiner Robert Mahera. That conclusion is consistent with CNN’s analysis that the gunman was on a rooftop 393 to 492 feet from the catwalk when shots were fired.
It is not clear if the analysis concludes that the shooter had 3 guns in his possession, that there were possible accomplices, or if the shots ultimately came from Secret Service snipers.
The shots exemplify a “crack-pop” sequence, typically when an ultrasonic bullet passes through a microphone, before “the corresponding muzzle blast sound arrives,” Maher, who teaches audio forensics at the University of Montana, told CNN. .
The time between those markers puts the shooter 110 to 120 meters from the mic, Maher said, assuming the bullet is traveling at an average speed of 800 to 1,000 meters per second, which equates to 2,600 to 3,280 feet per second.
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