JAKARTA, Indonesia -- A powerful earthquake struck off the coast of Indonesia's Sumatra island Wednesday afternoon, killing at least 100 people and trapping thousands of people beneath flattened buildings. A complete death toll wasn't possible in the immediate aftermath but Indonesian officials indicated the toll could rise significantly. Podcast from the Indonesian capital of Jakarta. More Back-to-Back Temblors Were Unusual The earthquake had a magnitude of 7.6, according to the U.S. Geological Survey, and hit offshore 30 miles from Padang, a city of about 750,000 on Sumatra's western coast. The quake was felt as far as Bangkok, about 1,000 miles...