A powerful 6.4-magnitude earthquake rattled the Indonesian island of Bali early this morning, but no destruction, injuries, or tsunami warning have been reported so far, AFP reports. The epicenter was 172 miles south of Denpasar, 5 miles deep in the Indian Ocean. Indonesia is located on the so-called "Ring of Fire," where the clashing of continental plates leads to regular volcanic and seismic events. (More Bali stories.)