NEW YORK - A boom truck collapsed Tuesday afternoon in Upper Manhattan. The Department of Buildings was first called to 3880 9th Avenue around 2:25 p.m. after receiving reports that several workers were injured by falling debris. According to inspectors, a knuckle boom truck was lifting a load of plywood on the second-floor deck of a 17-story building under construction, when the boom gave way and fell. Five people were hurt, including three with serious injuries and two with minor injuries.