July Fourth celebrations in Highland Park, Illinois, end in terror after mass shooting leaves 6 dead and dozens injured

A day of national celebration turned to tragedy Monday when a gunman killed six people and injured dozens more at a July Fourth parade in Highland Park, Illinois -- leaving the nation grieving yet another mass shooting.

The suspected shooter, identified by authorities as Robert E. Crimo III, used a "high-powered rifle" in an attack that appeared to be "random" and "intentional," police said. They believe the shooter, who was apprehended later Monday, climbed onto a rooftop of a business and opened fire on the parade about 20 minutes after it started.

Some bystanders initially thought...