Grand jury will investigate April duct collapse at Pennsylvania elementary

From The Pittsburgh Post-Gazette: Allegheny County, Pa., District Attorney Stephen A. Zappala Jr. says a grand jury will investigate an April air duct collapse at Shaler Area Elementary School in Glenshaw that injured eight students and four faculty members. The large metal duct, suspended from the cafeteria ceiling, fell onto a table crowded with students at lunch time on April 3.