Indonesian officials say a powerful earthquake off the coast of the island of Sumatra has killed 13 people. The quake destroyed many buildings and cut communications in and around the city of Padang. Residents say people are trapped in the rubble and some bridges have collapsed. The quake which had a magnitude of 7.6 was felt hundreds of kilometres away in Singapore and Malaysia. From Jakarta here is Karishma Vaswani. The Pacific Tsunami Warning Centre had issued a tsunami alert minutes after the earthquake hit off the coast of west Sumatra but then lifted it. The tremor was felt as far away as Indonesia's capital city, Jakarta. There have been reports of buildings and houses collapsing in the city of Padang, Sumatra's capital, which is near the epicentre of the earthquake.