At least 70 people are dead following a strong earthquake followed by an almost equally strong aftershock in western Indonesia, a local disaster coordination official said.
Indonesian television showed widespread damage to buildings on the island, including a hospital that had to be evacuated.
The quakes sent frightened people running from their homes, Deputy Governor Syamsudin said in the city of Solok.
The U.S. Geological Survey reported a magnitude 6.3 earthquake about 30 miles north-northeast of Padang at 10:50 a.m. (0350 GMT). A 6.1 temblor followed two hours later within miles of the first quake's epicenter.
The quake was felt as far as away as Malaysia and Singapore, where several office buildings were evacuated.
Indonesia is the world's largest archipelago and is prone to seismic upheaval due to its location on the so-called Pacific "Ring of Fire," an arc of volcanoes and fault lines encircling the Pacific Basin.
In December 2004, a massive earthquake struck off Indonesia's Sumatra island and triggered a tsunami that killed more than 230,000 people, including 131,000 people in Indonesia's Aceh province alone. A tsunami off Java island last year killed nearly 5,000.