The 17-year-old boy walked across Valley Fair shopping mall on Black Friday, police said, accompanied by a young woman, her baby in a stroller and a loaded semi-automatic handgun.

When he encountered a man in rival gang colors on the mall’s second floor, police said, nothing seemed to deter him: not his recent arrest and probation on a weapons charge, not the mall’s ubiquitous surveillance cameras and not the potential of hitting innocent shoppers on one of the busiest shopping days of the year.

Cameras from all directions picked up a burst of at least six rapid fire gunshots, the screams and the panic as the teen’s alleged 28-year-old target, an 18-year-old woman and 16-year-old girl, who were emerging from a store and didn’t know each other, collapsed on the marble floor outside the Fr

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