ARLINGTON, Va. (DC News Now) -- A middle schooler has been taken into custody after knives were found in his backpack Tuesday, according to the Arlington County Police Department (ACPD). Officers responded to reports of threats made at Swanson Middle School at around 12:30 p.m. on March 25. Cherry blossoms at Arlington National Cemetery reach full bloom There, police determined that three teenage boys were involved in an argument when one of the boys threatened to stab the other. ACPD said officers searched the teen's backpack and found two knives. According to police, the teen was taken into custody and a petition was obtained for possession of a weapon on school property. No one was hurt, authorities noted. ...read more read less