BRAINTREE — A busy Friday night at South Shore Plaza in Braintree was disrupted by gang violence when a shooting occurred at the Macy’s store, sending shoppers and employees running for the exits in a chaotic scene, authorities said.

The shooting occurred in the shoe department, where an altercation between two rival gang members from Boston “escalated into a shooting,” Braintree Police Chief Paul Shastany said at the scene shortly after 8:30 p.m.

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