At least five people were killed after a 7.7-magnitude earthquake struck off the Indonesian coast early on Saturday. The powerful tremor brought down homes and buildings, triggering widespread panic across a region frequently hit by deadly seismic activity.An initial tsunami alert was lifted when Indonesia’s Meteorology, Climatology and Geophysics Agency confirmed that sea-level monitoring showed no dangerous changes threatening coastal areas.According to the US Geological Survey, the quake struck the Flores region at 5:58am local time at a depth of 10km. Located 68km north-northwest of Ende in East Nusa Tenggara province, the primary quake was followed by several aftershocks.The quake struck the Flores region at 5:58am local time at a depth of 10km (AP)Preliminary reports from the Maumere Search and Rescue Agency said at least five residents were killed and two injured as the earthquake caused severe damage and collapsed buildings, Indonesia's disaster management agency said.Footage on local television showed patients at several hospitals being evacuated from buildings as a precaution following the quake. Hospital staff moved equipment outdoors, including beds, IV stands and oxygen cylinders, and set up temporary treatment areas to adapt to emergency conditions.Quake felt on Flores IslandThe quake was felt across much of Flores Island, with initial reports indicating heavy damage.Yohanna Embu, a resident of Sikka, a regency within East Nusa Tenggara province, said that a number of buildings were damaged by the strong shaking and panicked people ran to higher ground.“Many buildings here were damaged,” she said. “I saw the waiting room at the port terminal in Maumere had collapsed.”Students at St Peter Major Seminary in Sikka who were attending morning Mass fled in panic when the roof of an assembly hall collapsed, said Rev Guidelbertus Tanga, rector of the seminary, which is known locally as Ritapiret Seminary on the predominantly Catholic island of Flores.“Our students and nuns ran out in panic beneath a collapsing roof,” Tanga said. “At least one priest suffered a broken leg after jumping from the second floor of a building during the quake.”Indonesian authorities initially issued a tsunami warning for parts of East Nusa Tenggara, West Nusa Tenggara, South Sulawesi and Southeast Sulawesi provinces, and urged residents to stay away from beaches and riverbanks, and residents on the coastline to move to higher ground. The agency located the shallow undersea quake near Flores island.Indonesia prone to earthquakesIndonesia, a vast archipelago of more than 17,000 islands, is prone to earthquakes and volcanic activity because of its location on the “Ring of Fire”, an arc of volcanoes and fault lines in the Pacific Basin.In December of 1992, a powerful earthquake caused a tsunami that killed around 2,500 people on the southeastern island of Flores, part of a group of islands in the eastern half of Indonesia.