Quake hits off Indonesia's Sumatra island JAKARTA, April 11 (UPI) -- A 8.7-magnitude earthquake struck off the western coast of Sumatra, an Indonesian island, Wednesday, prompting a tsunami watch, officials said. The center of the earthquake, about 20 miles below the surface, was about 268 miles southwest of Banda Aceh and about 598 miles west of Kuala Lumpur, the U.S. Geological Survey reported. There were no initial reports of casualties or injuries. The Pacific Tsunami Warning Center issued a tsunami watch for 28 countries and Australia around the Indian Ocean, Indo-Asian News Service said. Power is out in Banda Aceh and residents were being moved to higher ground, said Sutopo Purwo Nugroho, a spokesman for the Indonesian National Disaster Management Agency. The earthquake's effects were felt across India's eastern coast, China's state-run news agency Xinhua said. Officials said they were assessing the extent of damage.