Forensic analysis suggests that as many as three weapons were fired at the Trump rally in Butler, Pennsylvania on Saturday. The FBI said Sunday that the shooter acted alone. The first three shots were consistent with alleged weapon A, the next five were consistent with alleged weapon B, and the final “acoustic impulse” was emitted by a possible weapon C, per audio analysis by Catalin Grigoras, director of the National Center for Media Forensics at the University of Colorado in Denver, and Cole Whitecotton, Senior Professional Research Associate at the same institution. Audio analysis has also confirmed that the gunman...