Police in the southern Australian city of Melbourne fatally shot a 15-year-old boy in a skate park after officers said he threatened them with knives. Police said the boy, whose identity has not been released, continued to approach them Thursday night even after they fired warning shots and twice hit him with pepper spray. Several officers fired at him, hitting him in the chest. He died at the scene. The shooting comes less than a week after police in Athens, Greece, fatally shot a 15-year-old boy, sparking massive riots.