BOSTON — A 17-year-old male was arrested Wednesday evening in Mattapan after police discovered he was carrying a loaded firearm with a large capacity magazine.
Officers from District B-3 were patrolling Woodmere Avenue around 8:07 p.m. when they observed four males walking in the area.
Police noticed one individual walking with his right arm pinned to his body while manipulating an object in his waistband…