SARGODHA, July 27: Five labourers died and 10 suffered serious injuries when the roof of a salt grinding factory caved in during rain near Utra Mor on Quaidabad-Jauharabad road, 70 kilometres off here, on Wednesday. The dead were identified as Maulvi Mohammad Abbas, Mohammad Ramzan, Shaukat Hayat, Alam Sher and Mehboob.