A strong earthquake has struck off the northwest coast of the Indonesian island of Sumatra, shaking buildings and triggering some panic. The quake, which the U.S. Geological Survey measured at 6.8, was centered 386 kilometers (240 miles) south-southeast of Banda Aceh. Tuesday morning's quake hit the same Indonesian region that was devastated by a tsunami after a massive earthquake on December 26. More than 226,000 people were listed as dead or missing from the tsunami that was generated across the Indian Ocean that day, while 1.7 million were displaced and more than 500,000 lost their homes. The quake on Tuesday was "strongly felt," across west Sumatra and outlying islands, Budi Waluyu, from the government's geophysical and meteorological agency, told The Associated Press. But there were no immediate reports of any damage or injuries.