An 18-year-old was arrested Tuesday after a shooting outside Gloucester City Middle School in Camden County Sunday evening, authorities said. Taijun Blount, of Lindenwood, is facing charges of aggravated assault with a deadly weapon, endangering the welfare of a child, and related weapons offenses, according to a statement released by Gloucester City Police Department. He is being held at Camden County jail while awaiting a detention hearing. Officers responded to the Gloucester City Middle School at 7:59 p.m. on Sunday for a report of gunshots, police said. Investigators determined several sh…