A gunman opened fire on a downtown street during the morning rush hour Monday in this southern Australian city, killing one person, wounding two and sending hundreds of panicked bystanders fleeing in terror, police and media reports said. Two people were rushed to hospital in critical condition after being shot in the chest, Victoria state police said. Another was being treated at the scene and may have died, Channel Nine television reported. Police would not confirm the death, but said they were searching for the gunman, who began shooting on the corner of Flinders and William Streets in central Melbourne during the Monday morning rush hour, sending hundreds of frightened commuters fleeing. "I can confirm that three people have been shot. Two people have been conveyed to hospital, one person is being worked on at the scene. All three people are in a critical condition," Insp. Glenn Weir told Nine news.