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An up and coming rapper from Brooklyn with a score to settle was captured on surveillance video opening fire backstage at Irving Plaza during a T.I. concert, killing one and wounding two others, police sources said.

Troy Ave, of Brownsville, accidentally shot himself in the leg during the chaos, sources said.

He was charged with attempted murder and two counts of criminal possession of a weapon, cops said. He is expected to face a murder charge pending the results of a ballstics test, according to sources.

Troy Ave, who was to perform at the show, was feuding with Maino, who is based in Bedford-Stuyvesant. Maino had just left the stage when his rival blasted at least five shots with a 9-mm handgun in a green room above the stage, sources said.

Video shows the gunman barging into the backstage area around 10 p.m. sporting a gold chain and opening fire as people lunge for cover, knocking over barstools.

“He walks right out, women all around, and starts shooting his gun,” a police source said.

“It’s an ongoing rap group rivalry, him and Maino.”

A hip hop producer said that it’s no surprise the performers don’t like each other.

“Bed-Stuy and Brownsville, it’s like mixing oil and water,” the producer said.

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