SYDNEY (AFP) – A tsunami crashed into Chile's coast Saturday in a potential portent of disaster across the vast Pacific Ocean as nations went on alert for towering waves generated by a killer earthquake. The ominous sound of evacuation sirens blared in Hawaii and French Polynesia as a tsunami raced around the Pacific's "Ring of Fire" after the 8.8-magnitude quake in Chile, which left at least 122 people dead. About 50 countries and territories along an arc stretching from New Zealand to Japan were braced for immensely powerful waves, not long after the fifth anniversary of the Indian Ocean disaster that killed more than 220,000 people. The Pacific Tsunami...