Four building workers died and two were hospitalized Saturday after a roof collapsed on them during construction of a factory in a town in northern Hungary, MTI news agency reported, according to DPA. The workers were casting concrete at the facility in Gyongyos, which is being constructed for German firm Seissenschmidt AG, when the several-hundred-square-metre roof caved in on them. Six other workers escaped uninjured. Seissenschmidt AG makes components for the automotive industry, and the facility was due to open in February 2007 to produce axles and drive shafts.