Investigators say they have now located four sets of human remains in the rubble of last week’s explosion at an industrial complex in Ottawa on Jan. 13. However, they are still working on recovering the bodies. Regional supervising coroner Louise McNaughton-Filion says trying to access the remains is still unsafe, as it could pose a safety threat to rescue personnel, but investigators will recover the remains and analyze them to identify the victims and determine the cause of death as soon as it’s safe to do so. Ottawa Police Insp. Frank D’Aoust says the explosion at Eastway Tank, Pump and Meter Ltd., and the subsequent fire caused the factory roof to collapse and destroy part of the building. “The structure is being dismantled and searched,” he said, adding that this is a long, methodical process that could take several more days to complete. Given the extent of damage to the building, “there are …