A powerful earthquake hit Osaka and other parts of Japan's second-largest metropolitan area Monday morning, leaving at least four people dead and more than 300 injured as concrete walls around buildings crumbled, water pipes burst and power was cut off.Over 1,000 people sought shelter in school gymnasiums and other evacuation centers following the magnitude-6.1 temblor that shook the northern part of Osaka Prefecture. Rush-hour traffic was disrupted and fires broke out, although no deadly ones occurred.The quake at 7:58 a.m. registered lower 6 on the Japanese seismic intensity scale of 7 …READ FULL ARTICLE