SAN JUAN, Puerto Rico - A 6.0-magnitude earthquake and several aftershocks rocked Puerto Rico overnight as Tropical Storm Karen churned toward the island, officials said. According to the U.S. Geological Survey, the quake, centered about 38 miles north-northwest of San Antonio, Puerto Rico, struck at 11:23 p.m. Monday. Several aftershocks, ranging in magnitude from 2.5 to 5.1, followed, the agency said. The National Weather Service said the temblor did not pose a tsunami risk to Puerto Rico, a U.S. territory. So far, emergency management officials have not received any reports of injuries or significant damage associated with the earthquake, The...