Four people were killed in a mass shooting Tuesday in the northern Australian city of Darwin, police said.Northern Territory Police Commissioner Reece Kershaw said a 45-year-old Caucasian man was arrested and is being held in hospital after opening fire at multiple locations across central Darwin.One woman is in hospital with non-life threatening injuries.Kershaw said the first phone call to emergency services was received at 5:45 p.m. local time.Police believe the suspect tried to hand himself in about an hour later by contacting the duty superintendent. "He asked to be placed into protect…READ FULL ARTICLE