May 1 (UPI) -- Authorities in central Australia called for calm Friday after police and rioters clashed overnight in remote Alice Springs following the arrest of a man accused of killing a 5-year-old Aboriginal girl. Several police officers, firefighters and emergency services workers were injured in the unrest, prompting officials to use non-lethal and chemical munitions to disperse the crowd, authorities said. At least one police vehicle was destroyed, three or four sustained significant