TORONTO The Office of the Fire Marshal has been called in to investigate a home explosion on Hamilton’s west mountain Friday night. At around 10:30 p.m., Hamilton fire received multiple calls about an explosion at 279 Bonaventure Drive, near Clifton Downs Road. Upon arrival, crews noticed no visible fire but that a home had been completely leveled, fire officials said. Crews also noticed a strong smell of natural gas at the scene. “As the crews started to make their way into the debris, we realized that we had one house that has been leveled, houses on either side that have been significantly damaged and we have a fairly large debris field,” Hamilton Fire Chief David Cunliffe told reporters.